ALTER DATABASE test CHARACTER SET latin1 COLLATE latin1_swedish_ci;
create temporary table t (a char(1) character set filename) engine=innodb;
drop temporary table t; set optimizer_switch = 'mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
drop table if exists t1,t2,t3,t4;
drop database if exists mysqltest;
CREATE TABLE bug58912 (a BLOB, b TEXT, PRIMARY KEY(a(1))) ENGINE=InnoDB;
INSERT INTO bug58912 VALUES(REPEAT('a',8000),REPEAT('b',8000));
UPDATE bug58912 SET a=REPEAT('a',7999);
create table t1 (id int unsigned not null auto_increment, code tinyint unsigned not null, name char(20) not null, primary key (id), key (code), unique (name)) engine=innodb;
insert into t1 (code, name) values (1, 'Tim'), (1, 'Monty'), (2, 'David'), (2, 'Erik'), (3, 'Sasha'), (3, 'Jeremy'), (4, 'Matt');
select id, code, name from t1 order by id;
id code name 11 Tim 21 Monty 32 David 42 Erik 53 Sasha 63 Jeremy 74 Matt
update ignore t1 set id = 8, name = 'Sinisa' where id < 3;
select id, code, name from t1 order by id;
id code name 21 Monty 32 David 42 Erik 53 Sasha 63 Jeremy 74 Matt 81 Sinisa
update ignore t1 set id = id + 10, name = 'Ralph' where id < 4;
select id, code, name from t1 order by id;
id code name 32 David 42 Erik 53 Sasha 63 Jeremy 74 Matt 81 Sinisa 121 Ralph
drop table t1;
CREATE TABLE t1 (
id int(11) NOT NULL auto_increment,
parent_id int(11) DEFAULT '0'NOT NULL,
level tinyint(4) DEFAULT '0'NOT NULL,
PRIMARY KEY (id),
KEY parent_id (parent_id),
KEY level (level)
) engine=innodb stats_persistent=0;
INSERT INTO t1 VALUES (1,0,0),(3,1,1),(4,1,1),(8,2,2),(9,2,2),(17,3,2),(22,4,2),(24,4,2),(28,5,2),(29,5,2),(30,5,2),(31,6,2),(32,6,2),(33,6,2),(203,7,2),(202,7,2),(20,3,2),(157,0,0),(193,5,2),(40,7,2),(2,1,1),(15,2,2),(6,1,1),(34,6,2),(35,6,2),(16,3,2),(7,1,1),(36,7,2),(18,3,2),(26,5,2),(27,5,2),(183,4,2),(38,7,2),(25,5,2),(37,7,2),(21,4,2),(19,3,2),(5,1,1),(179,5,2);
update t1 set parent_id=parent_id+100;
select * from t1 where parent_id=102;
id parent_id level 81022 91022 151022
update t1 set id=id+1000;
update t1 set id=1024 where id=1009;
Got one of the listed errors
select * from t1;
id parent_id level 10011000 10021011 10031011 10041011 10051011 10061011 10071011 10081022 10091022 10151022 10161032 10171032 10181032 10191032 10201032 10211042 10221042 10241042 10251052 10261052 10271052 10281052 10291052 10301052 10311062 10321062 10331062 10341062 10351062 10361072 10371072 10381072 10401072 11571000 11791052 11831042 11931052 12021072 12031072
update ignore t1 set id=id+1;
select * from t1;
id parent_id level 10011000 10021011 10031011 10041011 10051011 10061011 10071011 10081022 10101022 10151022 10161032 10171032 10181032 10191032 10201032 10211042 10231042 10241042 10251052 10261052 10271052 10281052 10291052 10301052 10311062 10321062 10331062 10341062 10351062 10361072 10371072 10391072 10411072 11581000 11801052 11841042 11941052 12021072 12041072
update ignore t1 set id=1023 where id=1010;
select * from t1 where parent_id=102;
id parent_id level 10081022 10101022 10151022
explain select level from t1 where level=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref level level 1 const # Using index
explain select level,id from t1 where level=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref level level 1 const # Using index
explain select level,id,parent_id from t1 where level=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref level level 1 const #
select level,id from t1 where level=1;
level id 11002 11003 11004 11005 11006 11007
select level,id,parent_id from t1 where level=1;
level id parent_id 11002101 11003101 11004101 11005101 11006101 11007101
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize note Table does not support optimize, doing recreate + analyze instead
test.t1 optimize status OK
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 0 PRIMARY 1 id A # NULL NULL BTREE NO
t1 1 parent_id 1 parent_id A # NULL NULL BTREE NO
t1 1 level 1 level A # NULL NULL BTREE NO
drop table t1;
CREATE TABLE t1 (
gesuchnr int(11) DEFAULT '0'NOT NULL,
benutzer_id int(11) DEFAULT '0'NOT NULL,
PRIMARY KEY (gesuchnr,benutzer_id)
) engine=innodb; replace into t1 (gesuchnr,benutzer_id) values (2,1); replace into t1 (gesuchnr,benutzer_id) values (1,1); replace into t1 (gesuchnr,benutzer_id) values (1,1);
select * from t1;
gesuchnr benutzer_id 11 21
drop table t1;
create table t1 (a int) engine=innodb;
insert into t1 values (1), (2);
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize note Table does not support optimize, doing recreate + analyze instead
test.t1 optimize status OK
delete from t1 where a = 1;
select * from t1;
a 2
check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
drop table t1;
create table t1 (a int,b varchar(20)) engine=innodb;
insert into t1 values (1,""), (2,"testing");
delete from t1 where a = 1;
select * from t1;
a b 2 testing
create index skr on t1 (a);
insert into t1 values (3,""), (4,"testing");
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 1 skr 1 a A # NULL NULL YES BTREE NO
drop table t1;
create table t1 (a int,b varchar(20),key(a)) engine=innodb;
insert into t1 values (1,""), (2,"testing");
select * from t1 where a = 1;
a b 1
drop table t1;
create table t1 (n int not null primary key) engine=innodb; set autocommit=0;
insert into t1 values (4);
rollback;
select n, "after rollback" from t1;
n after rollback
insert into t1 values (4);
commit;
select n, "after commit" from t1;
n after commit 4 after commit
commit;
insert into t1 values (5);
insert into t1 values (4); ERROR23000: Duplicate entry '4' for key 'PRIMARY'
commit;
select n, "after commit" from t1;
n after commit 4 after commit 5 after commit set autocommit=1;
insert into t1 values (6);
insert into t1 values (4); ERROR23000: Duplicate entry '4' for key 'PRIMARY'
select n from t1;
n 4 5 6 set autocommit=0;
begin;
savepoint `my_savepoint`;
insert into t1 values (7);
savepoint `savept2`;
insert into t1 values (3);
select n from t1;
n 3 4 5 6 7
savepoint savept3;
rollback to savepoint savept2;
rollback to savepoint savept3; ERROR42000: SAVEPOINT savept3 does not exist
rollback to savepoint savept2;
release savepoint `my_savepoint`;
select n from t1;
n 4 5 6 7
rollback to savepoint `my_savepoint`; ERROR42000: SAVEPOINT my_savepoint does not exist
rollback to savepoint savept2; ERROR42000: SAVEPOINT savept2 does not exist
insert into t1 values (8);
savepoint sv;
commit;
savepoint sv; set autocommit=1;
rollback;
drop table t1;
create table t1 (n int not null primary key) engine=innodb;
start transaction;
insert into t1 values (4);
flush tables with read lock;
commit;
unlock tables;
commit;
select * from t1;
n 4
drop table t1;
create table t1 ( id int NOT NULL PRIMARY KEY, nom varchar(64)) engine=innodb;
begin;
insert into t1 values(1,'hamdouni');
select id as afterbegin_id,nom as afterbegin_nom from t1;
afterbegin_id afterbegin_nom 1 hamdouni
rollback;
select id as afterrollback_id,nom as afterrollback_nom from t1;
afterrollback_id afterrollback_nom set autocommit=0;
insert into t1 values(2,'mysql');
select id as afterautocommit0_id,nom as afterautocommit0_nom from t1;
afterautocommit0_id afterautocommit0_nom 2 mysql
rollback;
select id as afterrollback_id,nom as afterrollback_nom from t1;
afterrollback_id afterrollback_nom set autocommit=1;
drop table t1;
CREATE TABLE t1 (id char(8) not null primary key, val int not null) engine=innodb;
insert into t1 values ('pippo', 12);
insert into t1 values ('pippo', 12); ERROR23000: Duplicate entry 'pippo' for key 'PRIMARY'
delete from t1;
delete from t1 where id = 'pippo';
select * from t1;
id val
insert into t1 values ('pippo', 12); set autocommit=0;
delete from t1;
rollback;
select * from t1;
id val
pippo 12
delete from t1;
commit;
select * from t1;
id val
drop table t1;
create table t1 (a integer) engine=innodb;
start transaction;
rename table t1 to t2;
create table t1 (b integer) engine=innodb;
insert into t1 values (1);
rollback;
drop table t1;
rename table t2 to t1;
drop table t1; set autocommit=1;
CREATE TABLE t1 (ID INTEGER NOT NULL PRIMARY KEY, NAME VARCHAR(64)) ENGINE=innodb;
INSERT INTO t1 VALUES (1, 'Jochen');
select * from t1;
ID NAME 1 Jochen
drop table t1;
CREATE TABLE t1 ( _userid VARCHAR(60) NOT NULL PRIMARY KEY) ENGINE=innodb; set autocommit=0;
INSERT INTO t1 SET _userid='marc@anyware.co.uk';
COMMIT;
SELECT * FROM t1;
_userid
marc@anyware.co.uk
SELECT _userid FROM t1 WHERE _userid='marc@anyware.co.uk';
_userid
marc@anyware.co.uk
drop table t1; set autocommit=1;
CREATE TABLE t1 (
user_id int(10) DEFAULT '0'NOT NULL,
name varchar(100),
phone varchar(100),
ref_email varchar(100) DEFAULT ''NOT NULL,
detail varchar(200),
PRIMARY KEY (user_id,ref_email)
)engine=innodb;
INSERT INTO t1 VALUES (10292,'sanjeev','29153373','sansh777@hotmail.com','xxx'),(10292,'shirish','2333604','shirish@yahoo.com','ddsds'),(10292,'sonali','323232','sonali@bolly.com','filmstar');
select * from t1 where user_id=10292;
user_id name phone ref_email detail 10292 sanjeev 29153373 sansh777@hotmail.com xxx 10292 shirish 2333604 shirish@yahoo.com ddsds 10292 sonali 323232 sonali@bolly.com filmstar
INSERT INTO t1 VALUES (10291,'sanjeev','29153373','sansh777@hotmail.com','xxx'),(10293,'shirish','2333604','shirish@yahoo.com','ddsds');
select * from t1 where user_id=10292;
user_id name phone ref_email detail 10292 sanjeev 29153373 sansh777@hotmail.com xxx 10292 shirish 2333604 shirish@yahoo.com ddsds 10292 sonali 323232 sonali@bolly.com filmstar
select * from t1 where user_id>=10292;
user_id name phone ref_email detail 10292 sanjeev 29153373 sansh777@hotmail.com xxx 10292 shirish 2333604 shirish@yahoo.com ddsds 10292 sonali 323232 sonali@bolly.com filmstar 10293 shirish 2333604 shirish@yahoo.com ddsds
select * from t1 where user_id>10292;
user_id name phone ref_email detail 10293 shirish 2333604 shirish@yahoo.com ddsds
select * from t1 where user_id<10292;
user_id name phone ref_email detail 10291 sanjeev 29153373 sansh777@hotmail.com xxx
drop table t1;
CREATE TABLE t1 (a int not null, b int not null,c int not null,
key(a),primary key(a,b), unique(c),key(a),unique(b));
Warnings:
Note 1831 Duplicate index `a_2`. This is deprecated and will be disallowed in a future release
show index from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 0 PRIMARY 1 a A # NULL NULL BTREE NO
t1 0 PRIMARY 2 b A # NULL NULL BTREE NO
t1 0 c 1 c A # NULL NULL BTREE NO
t1 0 b 1 b A # NULL NULL BTREE NO
t1 1 a 1 a A # NULL NULL BTREE NO
t1 1 a_2 1 a A # NULL NULL BTREE NO
drop table t1;
create table t1 (col1 int not null, col2 char(4) not null, primary key(col1));
alter table t1 engine=innodb;
insert into t1 values ('1','1'),('5','2'),('2','3'),('3','4'),('4','4');
select * from t1;
col1 col2 11 23 34 44 52
update t1 set col2='7' where col1='4';
select * from t1;
col1 col2 11 23 34 47 52
alter table t1 add co3 int not null;
select * from t1;
col1 col2 co3 110 230 340 470 520
update t1 set col2='9' where col1='2';
select * from t1;
col1 col2 co3 110 290 340 470 520
drop table t1;
create table t1 (a int not null , b int, primary key (a)) engine = innodb;
create table t2 (a int not null , b int, primary key (a)) engine = myisam;
insert into t1 VALUES (1,3) , (2,3), (3,3);
select * from t1;
a b 13 23 33
insert into t2 select * from t1;
select * from t2;
a b 13 23 33
delete from t1 where b = 3;
select * from t1;
a b
insert into t1 select * from t2;
select * from t1;
a b 13 23 33
select * from t2;
a b 13 23 33
drop table t1,t2;
CREATE TABLE t1 (
user_name varchar(12),
password text,
subscribed char(1),
user_id int(11) DEFAULT '0'NOT NULL,
quota bigint(20),
weight double,
access_date date,
access_time time,
approved datetime,
dummy_primary_key int(11) NOT NULL auto_increment,
PRIMARY KEY (dummy_primary_key)
) ENGINE=innodb;
INSERT INTO t1 VALUES ('user_0','somepassword','N',0,0,0,'2000-09-07','23:06:59','2000-09-07 23:06:59',1);
INSERT INTO t1 VALUES ('user_1','somepassword','Y',1,1,1,'2000-09-07','23:06:59','2000-09-07 23:06:59',2);
INSERT INTO t1 VALUES ('user_2','somepassword','N',2,2,1.4142135623731,'2000-09-07','23:06:59','2000-09-07 23:06:59',3);
INSERT INTO t1 VALUES ('user_3','somepassword','Y',3,3,1.7320508075689,'2000-09-07','23:06:59','2000-09-07 23:06:59',4);
INSERT INTO t1 VALUES ('user_4','somepassword','N',4,4,2,'2000-09-07','23:06:59','2000-09-07 23:06:59',5);
select user_name, password , subscribed, user_id, quota, weight, access_date, access_time, approved, dummy_primary_key from t1 order by user_name;
user_name password subscribed user_id quota weight access_date access_time approved dummy_primary_key
user_0 somepassword N 0002000-09-0723:06:592000-09-0723:06:591
user_1 somepassword Y 1112000-09-0723:06:592000-09-0723:06:592
user_2 somepassword N 221.41421356237312000-09-0723:06:592000-09-0723:06:593
user_3 somepassword Y 331.73205080756892000-09-0723:06:592000-09-0723:06:594
user_4 somepassword N 4422000-09-0723:06:592000-09-0723:06:595
drop table t1;
CREATE TABLE t1 (
id int(11) NOT NULL auto_increment,
parent_id int(11) DEFAULT '0'NOT NULL,
level tinyint(4) DEFAULT '0'NOT NULL,
KEY (id),
KEY parent_id (parent_id),
KEY level (level)
) engine=innodb;
INSERT INTO t1 VALUES (1,0,0),(3,1,1),(4,1,1),(8,2,2),(9,2,2),(17,3,2),(22,4,2),(24,4,2),(28,5,2),(29,5,2),(30,5,2),(31,6,2),(32,6,2),(33,6,2),(203,7,2),(202,7,2),(20,3,2),(157,0,0),(193,5,2),(40,7,2),(2,1,1),(15,2,2),(6,1,1),(34,6,2),(35,6,2),(16,3,2),(7,1,1),(36,7,2),(18,3,2),(26,5,2),(27,5,2),(183,4,2),(38,7,2),(25,5,2),(37,7,2),(21,4,2),(19,3,2),(5,1,1);
INSERT INTO t1 values (179,5,2);
update t1 set parent_id=parent_id+100;
select * from t1 where parent_id=102;
id parent_id level 81022 91022 151022
update t1 set id=id+1000;
update t1 set id=1024 where id=1009;
select * from t1;
id parent_id level 10011000 10031011 10041011 10081022 10241022 10171032 10221042 10241042 10281052 10291052 10301052 10311062 10321062 10331062 12031072 12021072 10201032 11571000 11931052 10401072 10021011 10151022 10061011 10341062 10351062 10161032 10071011 10361072 10181032 10261052 10271052 11831042 10381072 10251052 10371072 10211042 10191032 10051011 11791052
update ignore t1 set id=id+1;
select * from t1;
id parent_id level 10021000 10041011 10051011 10091022 10251022 10181032 10231042 10251042 10291052 10301052 10311052 10321062 10331062 10341062 12041072 12031072 10211032 11581000 11941052 10411072 10031011 10161022 10071011 10351062 10361062 10171032 10081011 10371072 10191032 10271052 10281052 11841042 10391072 10261052 10381072 10221042 10201032 10061011 11801052
update ignore t1 set id=1023 where id=1010;
select * from t1 where parent_id=102;
id parent_id level 10091022 10251022 10161022
explain select level from t1 where level=1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref level level 1 const # Using index
select level,id from t1 where level=1;
level id 11004 11005 11003 11007 11008 11006
select level,id,parent_id from t1 where level=1;
level id parent_id 11004101 11005101 11003101 11007101 11008101 11006101
select level,id from t1 where level=1 order by id;
level id 11003 11004 11005 11006 11007 11008
delete from t1 where level=1;
select * from t1;
id parent_id level 10021000 10091022 10251022 10181032 10231042 10251042 10291052 10301052 10311052 10321062 10331062 10341062 12041072 12031072 10211032 11581000 11941052 10411072 10161022 10351062 10361062 10171032 10371072 10191032 10271052 10281052 11841042 10391072 10261052 10381072 10221042 10201032 11801052
drop table t1;
CREATE TABLE t1 (
sca_code char(6) NOT NULL,
cat_code char(6) NOT NULL,
sca_desc varchar(50),
lan_code char(2) NOT NULL,
sca_pic varchar(100),
sca_sdesc varchar(50),
sca_sch_desc varchar(16),
PRIMARY KEY (sca_code, cat_code, lan_code),
INDEX sca_pic (sca_pic)
) engine = innodb ;
INSERT INTO t1 ( sca_code, cat_code, sca_desc, lan_code, sca_pic, sca_sdesc, sca_sch_desc) VALUES ( 'PD', 'J', 'PENDANT', 'EN', NULL, NULL, 'PENDANT'),( 'RI', 'J', 'RING', 'EN', NULL, NULL, 'RING'),( 'QQ', 'N', 'RING', 'EN', 'not null', NULL, 'RING');
select count(*) from t1 where sca_code = 'PD';
count(*) 1
select count(*) from t1 where sca_code <= 'PD';
count(*) 1
select count(*) from t1 where sca_pic is null;
count(*) 2
alter table t1 drop index sca_pic, add index sca_pic (cat_code, sca_pic);
select count(*) from t1 where sca_code='PD'and sca_pic is null;
count(*) 1
select count(*) from t1 where cat_code='E';
count(*) 0
alter table t1 drop index sca_pic, add index (sca_pic, cat_code);
select count(*) from t1 where sca_code='PD'and sca_pic is null;
count(*) 1
select count(*) from t1 where sca_pic >= 'n';
count(*) 1
select sca_pic from t1 where sca_pic is null;
sca_pic
NULL
NULL
update t1 set sca_pic="test" where sca_pic is null;
delete from t1 where sca_code='pd';
drop table t1; set @a:=now();
CREATE TABLE t1 (a int not null, b timestamp not null default
current_timestamp on update current_timestamp, primary key (a)) engine=innodb;
insert into t1 (a) values(1),(2),(3);
select t1.a from t1 natural join t1 as t2 where t1.b >= @a order by t1.a;
a 1 2 3
select a from t1 natural join t1 as t2 where b >= @a order by a;
a 1 2 3
update t1 set a=5 where a=1;
select a from t1;
a 2 3 5
drop table t1;
create table t1 (a varchar(100) not null, primary key(a), b int not null) engine=innodb;
insert into t1 values("hello",1),("world",2);
select * from t1 order by b desc;
a b
world 2
hello 1
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize note Table does not support optimize, doing recreate + analyze instead
test.t1 optimize status OK
show keys from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment Ignored
t1 0 PRIMARY 1 a A # NULL NULL BTREE NO
drop table t1;
create table t1 (i int, j int ) ENGINE=innodb;
insert into t1 values (1,2);
select * from t1 where i=1and j=2;
i j 12
create index ax1 on t1 (i,j);
select * from t1 where i=1and j=2;
i j 12
drop table t1;
CREATE TABLE t1 (
a int3 unsigned NOT NULL,
b int1 unsigned NOT NULL,
UNIQUE (a, b)
) ENGINE = innodb;
INSERT INTO t1 VALUES (1, 1);
SELECT MIN(B),MAX(b) FROM t1 WHERE t1.a = 1; MIN(B) MAX(b) 11
drop table t1;
CREATE TABLE t1 (a int unsigned NOT NULL) engine=innodb;
INSERT INTO t1 VALUES (1);
SELECT * FROM t1;
a 1
DROP TABLE t1;
create table t1 (a int primary key,b int, c int, d int, e int, f int, g int, h int, i int, j int, k int, l int, m int, n int, o int, p int, q int, r int, s int, t int, u int, v int, w int, x int, y int, z int, a1 int, a2 int, a3 int, a4 int, a5 int, a6 int, a7 int, a8 int, a9 int, b1 int, b2 int, b3 int, b4 int, b5 int, b6 int) engine = innodb;
insert into t1 values (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1);
explain select * from t1 where a > 0and a < 50;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL # Using index condition
drop table t1;
create table t1 (id int NOT NULL,id2 int NOT NULL,id3 int NOT NULL,dummy1 char(30),primary key (id,id2),index index_id3 (id3)) engine=innodb;
insert into t1 values (0,0,0,'ABCDEFGHIJ'),(2,2,2,'BCDEFGHIJK'),(1,1,1,'CDEFGHIJKL');
LOCK TABLES t1 WRITE;
insert into t1 values (99,1,2,'D'),(1,1,2,'D'); ERROR23000: Duplicate entry '1-1' for key 'PRIMARY'
select id from t1;
id 0 1 2
select id from t1;
id 0 1 2
UNLOCK TABLES;
DROP TABLE t1;
create table t1 (id int NOT NULL,id2 int NOT NULL,id3 int NOT NULL,dummy1 char(30),primary key (id,id2),index index_id3 (id3)) engine=innodb;
insert into t1 values (0,0,0,'ABCDEFGHIJ'),(2,2,2,'BCDEFGHIJK'),(1,1,1,'CDEFGHIJKL');
LOCK TABLES t1 WRITE;
begin;
insert into t1 values (99,1,2,'D'),(1,1,2,'D'); ERROR23000: Duplicate entry '1-1' for key 'PRIMARY'
select id from t1;
id 0 1 2
insert ignore into t1 values (100,1,2,'D'),(1,1,99,'D');
Warnings:
Warning 1062 Duplicate entry '1-1' for key 'PRIMARY'
commit;
select id,id3 from t1;
id id3 00 11 22 1002
UNLOCK TABLES;
DROP TABLE t1;
create table t1 (a char(20), unique (a(5))) engine=innodb;
drop table t1;
create table t1 (a char(20), index (a(5))) engine=innodb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` char(20) DEFAULT NULL,
KEY `a` (`a`(5))
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
create temporary table t1 (a int not null auto_increment, primary key(a)) engine=innodb;
insert into t1 values (NULL),(NULL),(NULL);
delete from t1 where a=3;
insert into t1 values (NULL);
select * from t1;
a 1 2 4
alter table t1 add b int;
select * from t1;
a b 1 NULL 2 NULL 4 NULL
drop table t1;
create table t1
(
id int auto_increment primary key,
name varchar(32) not null,
value text not null,
uid int not null,
unique key(name,uid)
) engine=innodb;
insert into t1 values (1,'one','one value',101),
(2,'two','two value',102),(3,'three','three value',103); set insert_id=5; replace into t1 (value,name,uid) values ('other value','two',102);
delete from t1 where uid=102; set insert_id=5; replace into t1 (value,name,uid) values ('other value','two',102); set insert_id=6; replace into t1 (value,name,uid) values ('other value','two',102);
select * from t1;
id name value uid 1 one one value 101 3 three three value 103 6 two other value 102
drop table t1;
create database mysqltest;
create table mysqltest.t1 (a int not null) engine= innodb;
insert into mysqltest.t1 values(1);
create table mysqltest.t2 (a int not null) engine= myisam;
insert into mysqltest.t2 values(1);
create table mysqltest.t3 (a int not null) engine= heap;
insert into mysqltest.t3 values(1);
commit;
drop database mysqltest;
show tables from mysqltest; ERROR42000: Unknown database 'mysqltest' set autocommit=0;
create table t1 (a int not null) engine= innodb;
insert into t1 values(1),(2);
truncate table t1;
commit;
truncate table t1;
truncate table t1;
select * from t1;
a
insert into t1 values(1),(2);
delete from t1;
select * from t1;
a
commit;
drop table t1; set autocommit=1;
create table t1 (a int not null) engine= innodb;
insert into t1 values(1),(2);
truncate table t1;
insert into t1 values(1),(2);
select * from t1;
a 1 2
truncate table t1;
insert into t1 values(1),(2);
delete from t1;
select * from t1;
a
drop table t1;
create table t1 (a int not null, b int not null, c int not null, primary key (a),key(b)) engine=innodb;
insert into t1 values (3,3,3),(1,1,1),(2,2,2),(4,4,4);
explain select * from t1 order by a;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL PRIMARY 4 NULL #
explain select * from t1 order by b;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL # Using filesort
explain select * from t1 order by c;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL # Using filesort
explain select a from t1 order by a;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL PRIMARY 4 NULL #
explain select b from t1 order by b;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL b 4 NULL # Using index
explain select a,b from t1 order by b;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL b 4 NULL # Using index
explain select a,b from t1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL b 4 NULL # Using index
explain select a,b,c from t1;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL #
drop table t1;
create table t1 (t int not null default 1, key (t)) engine=innodb;
desc t1;
Field Type Null Key Default Extra
t int(11) NO MUL 1
drop table t1; SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
CREATE TABLE t1 (
number bigint(20) NOT NULL default '0',
cname char(15) NOT NULL default '',
carrier_id smallint(6) NOT NULL default '0',
privacy tinyint(4) NOT NULL default '0',
last_mod_date timestamp NOT NULL,
last_mod_id smallint(6) NOT NULL default '0',
last_app_date timestamp NOT NULL,
last_app_id smallint(6) default '-1',
version smallint(6) NOT NULL default '0',
assigned_scps int(11) default '0',
status tinyint(4) default '0'
) ENGINE=InnoDB;
INSERT INTO t1 VALUES (4077711111,'SeanWheeler',90,2,20020111112846,500,00000000000000,-1,2,3,1);
INSERT INTO t1 VALUES (9197722223,'berry',90,3,20020111112809,500,20020102114532,501,4,10,0);
INSERT INTO t1 VALUES (650,'San Francisco',0,0,20011227111336,342,00000000000000,-1,1,24,1);
INSERT INTO t1 VALUES (302467,'Sue\'s Subshop',90,3,20020109113241,500,20020102115111,501,7,24,0);
INSERT INTO t1 VALUES (6014911113,'SudzCarwash',520,1,20020102115234,500,20020102115259,501,33,32768,0);
INSERT INTO t1 VALUES (333,'tubs',99,2,20020109113440,501,20020109113440,500,3,10,0);
CREATE TABLE t2 (
number bigint(20) NOT NULL default '0',
cname char(15) NOT NULL default '',
carrier_id smallint(6) NOT NULL default '0',
privacy tinyint(4) NOT NULL default '0',
last_mod_date timestamp NOT NULL,
last_mod_id smallint(6) NOT NULL default '0',
last_app_date timestamp NOT NULL,
last_app_id smallint(6) default '-1',
version smallint(6) NOT NULL default '0',
assigned_scps int(11) default '0',
status tinyint(4) default '0'
) ENGINE=InnoDB;
INSERT INTO t2 VALUES (4077711111,'SeanWheeler',0,2,20020111112853,500,00000000000000,-1,2,3,1);
INSERT INTO t2 VALUES (9197722223,'berry',90,3,20020111112818,500,20020102114532,501,4,10,0);
INSERT INTO t2 VALUES (650,'San Francisco',90,0,20020109113158,342,00000000000000,-1,1,24,1);
INSERT INTO t2 VALUES (333,'tubs',99,2,20020109113453,501,20020109113453,500,3,10,0);
select * from t1;
number cname carrier_id privacy last_mod_date last_mod_id last_app_date last_app_id version assigned_scps status 4077711111 SeanWheeler 9022002-01-1111:28:465000000-00-0000:00:00 -1231 9197722223 berry 9032002-01-1111:28:095002002-01-0211:45:325014100 650 San Francisco 002001-12-2711:13:363420000-00-0000:00:00 -11241 302467 Sue's Subshop 90 3 2002-01-09 11:32:41 500 2002-01-02 11:51:11 501 7 24 0 6014911113 SudzCarwash 52012002-01-0211:52:345002002-01-0211:52:5950133327680 333 tubs 9922002-01-0911:34:405012002-01-0911:34:405003100
select * from t2;
number cname carrier_id privacy last_mod_date last_mod_id last_app_date last_app_id version assigned_scps status 4077711111 SeanWheeler 022002-01-1111:28:535000000-00-0000:00:00 -1231 9197722223 berry 9032002-01-1111:28:185002002-01-0211:45:325014100 650 San Francisco 9002002-01-0911:31:583420000-00-0000:00:00 -11241 333 tubs 9922002-01-0911:34:535012002-01-0911:34:535003100
delete t1, t2 from t1 left join t2 on t1.number=t2.number where (t1.carrier_id=90and t1.number=t2.number) or (t2.carrier_id=90and t1.number=t2.number) or (t1.carrier_id=90and t2.number is null);
select * from t1;
number cname carrier_id privacy last_mod_date last_mod_id last_app_date last_app_id version assigned_scps status 6014911113 SudzCarwash 52012002-01-0211:52:345002002-01-0211:52:5950133327680 333 tubs 9922002-01-0911:34:405012002-01-0911:34:405003100
select * from t2;
number cname carrier_id privacy last_mod_date last_mod_id last_app_date last_app_id version assigned_scps status 333 tubs 9922002-01-0911:34:535012002-01-0911:34:535003100
select * from t2;
number cname carrier_id privacy last_mod_date last_mod_id last_app_date last_app_id version assigned_scps status 333 tubs 9922002-01-0911:34:535012002-01-0911:34:535003100
drop table t1,t2; SET sql_mode = default;
create table t1 (id int unsigned not null auto_increment, code tinyint unsigned not null, name char(20) not null, primary key (id), key (code), unique (name)) engine=innodb;
BEGIN; SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SELECT @@transaction_isolation, @@global.transaction_isolation;
@@transaction_isolation @@global.transaction_isolation
SERIALIZABLE REPEATABLE-READ
insert into t1 (code, name) values (1, 'Tim'), (1, 'Monty'), (2, 'David');
select id, code, name from t1 order by id;
id code name 11 Tim 21 Monty 32 David
COMMIT;
BEGIN; SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
insert into t1 (code, name) values (2, 'Erik'), (3, 'Sasha');
select id, code, name from t1 order by id;
id code name 11 Tim 21 Monty 32 David 42 Erik 53 Sasha
COMMIT; SET binlog_format='MIXED';
BEGIN; SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
insert into t1 (code, name) values (3, 'Jeremy'), (4, 'Matt');
select id, code, name from t1 order by id;
id code name 11 Tim 21 Monty 32 David 42 Erik 53 Sasha 63 Jeremy 74 Matt
COMMIT;
DROP TABLE t1;
create table t1 (n int(10), d int(10)) engine=innodb;
create table t2 (n int(10), d int(10)) engine=innodb;
insert into t1 values(1,1),(1,2);
insert into t2 values(1,10),(2,20);
UPDATE t1,t2 SET t1.d=t2.d,t2.d=30 WHERE t1.n=t2.n;
select * from t1;
n d 110 110
select * from t2;
n d 130 220
drop table t1,t2;
drop table if exists t1, t2;
CREATE TABLE t1 (a int, PRIMARY KEY (a));
CREATE TABLE t2 (a int, PRIMARY KEY (a)) ENGINE=InnoDB;
create trigger trg_del_t2 after delete on t2 for each row
insert into t1 values (1);
insert into t1 values (1);
insert into t2 values (1),(2);
delete t2 from t2; ERROR23000: Duplicate entry '1' for key 'PRIMARY'
select count(*) from t2 /* must be 2 as restored after rollback caused by the error */;
count(*) 2
drop table t1, t2;
drop table if exists t1, t2;
CREATE TABLE t1 (a int, PRIMARY KEY (a));
CREATE TABLE t2 (a int, PRIMARY KEY (a)) ENGINE=InnoDB;
create trigger trg_del_t2 after delete on t2 for each row
insert into t1 values (1);
insert into t1 values (1);
insert into t2 values (1),(2);
delete t2 from t2; ERROR23000: Duplicate entry '1' for key 'PRIMARY'
select count(*) from t2 /* must be 2 as restored after rollback caused by the error */;
count(*) 2
drop table t1, t2;
create table t1 (a int, b int) engine=innodb;
insert into t1 values(20,null);
select t2.b, ifnull(t2.b,"this is null") from t1 as t2 left join t1 as t3 on
t2.b=t3.a;
b ifnull(t2.b,"this is null")
NULL this is null
select t2.b, ifnull(t2.b,"this is null") from t1 as t2 left join t1 as t3 on
t2.b=t3.a order by 1;
b ifnull(t2.b,"this is null")
NULL this is null
insert into t1 values(10,null);
select t2.b, ifnull(t2.b,"this is null") from t1 as t2 left join t1 as t3 on
t2.b=t3.a order by 1;
b ifnull(t2.b,"this is null")
NULL this is null
NULL this is null
drop table t1;
create table t1 (a varchar(10) not null) engine=myisam;
create table t2 (b varchar(10) not null unique) engine=innodb;
select t1.a from t1,t2 where t1.a=t2.b;
a
drop table t1,t2;
create table t1 (a int not null, b int, primary key (a)) engine = innodb;
create table t2 (a int not null, b int, primary key (a)) engine = innodb;
insert into t1 values (10, 20);
insert into t2 values (10, 20);
update t1, t2 set t1.b = 150, t2.b = t1.b where t2.a = t1.a and t1.a = 10;
drop table t1,t2;
CREATE TABLE t1 (id INT NOT NULL, PRIMARY KEY (id)) ENGINE=INNODB;
CREATE TABLE t2 (id INT PRIMARY KEY, t1_id INT, INDEX par_ind (t1_id), FOREIGN KEY (t1_id) REFERENCES t1(id) ON DELETE CASCADE ) ENGINE=INNODB;
insert into t1 set id=1;
insert into t2 set id=1, t1_id=1;
delete t1,t2 from t1,t2 where t1.id=t2.t1_id;
select * from t1;
id
select * from t2;
id t1_id
drop table t2,t1;
CREATE TABLE t1(id INT NOT NULL, PRIMARY KEY (id)) ENGINE=INNODB;
CREATE TABLE t2(id INT PRIMARY KEY, t1_id INT, INDEX par_ind (t1_id) ) ENGINE=INNODB;
INSERT INTO t1 VALUES(1);
INSERT INTO t2 VALUES(1, 1);
SELECT * from t1;
id 1
UPDATE t1,t2 SET t1.id=t1.id+1, t2.t1_id=t1.id+1;
SELECT * from t1;
id 2
UPDATE t1,t2 SET t1.id=t1.id+1 where t1.id!=t2.id;
SELECT * from t1;
id 3
DROP TABLE t1,t2; set autocommit=0;
CREATE TABLE t1 (id CHAR(15) NOT NULL, value CHAR(40) NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
CREATE TABLE t2 (id CHAR(15) NOT NULL, value CHAR(40) NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
CREATE TABLE t3 (id1 CHAR(15) NOT NULL, id2 CHAR(15) NOT NULL, PRIMARY KEY(id1, id2)) ENGINE=InnoDB;
INSERT INTO t3 VALUES("my-test-1", "my-test-2");
COMMIT;
INSERT INTO t1 VALUES("this-key", "will disappear");
INSERT INTO t2 VALUES("this-key", "will also disappear");
DELETE FROM t3 WHERE id1="my-test-1";
SELECT * FROM t1;
id value
this-key will disappear
SELECT * FROM t2;
id value
this-key will also disappear
SELECT * FROM t3;
id1 id2
ROLLBACK;
SELECT * FROM t1;
id value
SELECT * FROM t2;
id value
SELECT * FROM t3;
id1 id2
my-test-1 my-test-2
SELECT * FROM t3 WHERE id1="my-test-1" LOCK IN SHARE MODE;
id1 id2
my-test-1 my-test-2
COMMIT; set autocommit=1;
DROP TABLE t1,t2,t3;
CREATE TABLE t1 (a int not null primary key, b int not null, unique (b)) engine=innodb;
INSERT INTO t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
UPDATE t1 set a=a+100 where b between 2and3and a < 1000;
SELECT * from t1;
a b 11 1022 1033 44 55 66 77 88 99
drop table t1;
CREATE TABLE t2 ( NEXT_T BIGINT NOT NULL PRIMARY KEY) ENGINE=MyISAM;
CREATE TABLE t1 ( B_ID INTEGER NOT NULL PRIMARY KEY) ENGINE=InnoDB; SET AUTOCOMMIT=0;
INSERT INTO t1 ( B_ID ) VALUES ( 1 );
INSERT INTO t2 ( NEXT_T ) VALUES ( 1 );
ROLLBACK;
Warnings:
Warning 1196 Some non-transactional changed tables couldn't be rolled back
SELECT * FROM t1;
B_ID
drop table t1,t2;
create table t1 ( pk int primary key, parent int not null, child int not null, index (parent) ) engine = innodb;
insert into t1 values (1,0,4), (2,1,3), (3,2,1), (4,1,2);
select distinct parent,child from t1 order by parent;
parent child 04 12 13 21
drop table t1;
create table t1 (a int not null auto_increment primary key, b int, c int, key(c)) engine=innodb;
create table t2 (a int not null auto_increment primary key, b int);
insert into t1 (b) values (null),(null),(null),(null),(null),(null),(null);
insert into t2 (a) select b from t1;
insert into t1 (b) select b from t2;
insert into t2 (a) select b from t1;
insert into t1 (a) select b from t2;
insert into t2 (a) select b from t1;
insert into t1 (a) select b from t2;
insert into t2 (a) select b from t1;
insert into t1 (a) select b from t2;
insert into t2 (a) select b from t1;
insert into t1 (a) select b from t2;
select count(*) from t1;
count(*) 623
explain select * from t1 where c between 1and2500;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range c c 5 NULL # #
update t1 set c=a;
explain select * from t1 where c between 1and2500;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL c NULL NULL NULL # #
drop table t1,t2;
create table t1 (id int primary key auto_increment, fk int, index index_fk (fk)) engine=innodb;
insert into t1 (id) values (null),(null),(null),(null),(null);
update t1 set fk=69 where fk is null order by id limit 1;
SELECT * from t1;
id fk 2 NULL 3 NULL 4 NULL 5 NULL 169
drop table t1;
create table t1 (a int not null, b int not null, key (a));
insert into t1 values (1,1),(1,2),(1,3),(3,1),(3,2),(3,3),(3,1),(3,2),(3,3),(2,1),(2,2),(2,3); SET @tmp=0;
update t1 set b=(@tmp:=@tmp+1) order by a;
update t1 set b=99 where a=1 order by b asc limit 1;
update t1 set b=100 where a=1 order by b desc limit 2;
update t1 set a=a+10+b where a=1 order by b;
select * from t1 order by a,b;
a b 24 25 26 37 38 39 310 311 312 132 111100 111100
drop table t1;
create table t1 ( c char(8) not null ) engine=innodb;
insert into t1 values ('0'),('1'),('2'),('3'),('4'),('5'),('6'),('7'),('8'),('9');
insert into t1 values ('A'),('B'),('C'),('D'),('E'),('F');
alter table t1 add b char(8) not null;
alter table t1 add a char(8) not null;
alter table t1 add primary key (a,b,c);
update t1 set a=c, b=c;
create table t2 (c char(8) not null, b char(8) not null, a char(8) not null, primary key(a,b,c)) engine=innodb;
insert into t2 select * from t1;
delete t1,t2 from t2,t1 where t1.a<'B'and t2.b=t1.b;
drop table t1,t2; SET AUTOCOMMIT=1;
create table t1 (a integer auto_increment primary key) engine=innodb;
insert into t1 (a) values (NULL),(NULL);
truncate table t1;
insert into t1 (a) values (NULL),(NULL);
SELECT * from t1;
a 1 2
drop table t1;
CREATE TABLE t1 (`id 1` INT NOT NULL, PRIMARY KEY (`id 1`)) ENGINE=INNODB;
CREATE TABLE t2 (id INT PRIMARY KEY, t1_id INT, INDEX par_ind (t1_id), FOREIGN KEY (`t1_id`) REFERENCES `t1`(`id 1`) ON DELETE CASCADE ) ENGINE=INNODB;
drop table t2,t1;
create table `t1` (`id` int( 11 ) not null ,primary key ( `id` )) engine = innodb;
insert into `t1`values ( 1 ) ;
create table `t2` (`id` int( 11 ) not null default '0',unique key `id` ( `id` ) ,constraint `t1_id_fk` foreign key ( `id` ) references `t1` (`id` )) engine = innodb;
insert into `t2`values ( 1 ) ;
create table `t3` (`id` int( 11 ) not null default '0',key `id` ( `id` ) ,constraint `t2_id_fk` foreign key ( `id` ) references `t2` (`id` )) engine = innodb;
insert into `t3`values ( 1 ) ;
delete t3,t2,t1 from t1,t2,t3 where t1.id =1and t2.id = t1.id and t3.id = t2.id; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`))
update t1,t2,t3 set t3.id=5, t2.id=6, t1.id=7 where t1.id =1and t2.id = t1.id and t3.id = t2.id; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`))
update t3 set t3.id=7 where t1.id =1and t2.id = t1.id and t3.id = t2.id; ERROR42S22: Unknown column 't1.id' in 'WHERE'
drop table t3,t2,t1;
CREATE TABLE t1 (
c1 VARCHAR(8), c2 VARCHAR(8),
PRIMARY KEY (c1, c2)
) ENGINE=InnoDB;
CREATE TABLE t2 (
c0 INT PRIMARY KEY,
c1 VARCHAR(8) UNIQUE,
FOREIGN KEY (c1) REFERENCES t1 (c1) ON UPDATE CASCADE
) ENGINE=InnoDB;
INSERT INTO t1 VALUES ('old', 'somevalu'), ('other', 'anyvalue');
INSERT INTO t2 VALUES (10, 'old'), (20, 'other');
UPDATE t1 SET c1 = 'other' WHERE c1 = 'old'; ERROR23000: Foreign key constraint for table 't1', record 'other-somevalu' would lead to a duplicate entry in table 't2', key 'c1'
DROP TABLE t2,t1;
call mtr.add_suppression("Cannot delete/update rows with cascading foreign key constraints that exceed max depth of 15\\. Please drop excessive foreign constraints and try again");
create table t1(
id int primary key,
pid int,
index(pid),
foreign key(pid) references t1(id) on delete cascade) engine=innodb;
insert into t1 values(0,0),(1,0),(2,1),(3,2),(4,3),(5,4),(6,5),(7,6),
(8,7),(9,8),(10,9),(11,10),(12,11),(13,12),(14,13),(15,14);
delete from t1 where id=0;
Got one of the listed errors
delete from t1 where id=15;
delete from t1 where id=0;
drop table t1;
CREATE TABLE t1 (col1 int(1))ENGINE=InnoDB;
CREATE TABLE t2 (col1 int(1),stamp TIMESTAMP,INDEX stamp_idx
(stamp))ENGINE=InnoDB;
insert into t1 values (1),(2),(3);
insert ignore into t2 values (1, 20020204130000),(2, 20020204130000),(4,20020204310000 ),(5,20020204230000);
Warnings:
Warning 1265 Data truncated for column 'stamp' at row 3
SELECT col1 FROM t1 UNION SELECT col1 FROM t2 WHERE stamp < '20020204120000' GROUP BY col1;
col1 1 2 3 4
drop table t1,t2;
CREATE TABLE t1 (
`id` int(10) unsigned NOT NULL auto_increment,
`id_object` int(10) unsigned default '0',
`id_version` int(10) unsigned NOT NULL default '1',
`label` varchar(100) NOT NULL default '',
`description` text,
PRIMARY KEY (`id`),
KEY `id_object` (`id_object`),
KEY `id_version` (`id_version`)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES("6", "3382", "9", "Test", NULL), ("7", "102", "5", "Le Pekin (Test)", NULL),("584", "1794", "4", "Test de resto", NULL),("837", "1822", "6", "Test 3", NULL),("1119", "3524", "1", "Societe Test", NULL),("1122", "3525", "1", "Fournisseur Test", NULL);
CREATE TABLE t2 (
`id` int(10) unsigned NOT NULL auto_increment,
`id_version` int(10) unsigned NOT NULL default '1',
PRIMARY KEY (`id`),
KEY `id_version` (`id_version`)
) ENGINE=InnoDB;
INSERT INTO t2 VALUES("3524", "1"),("3525", "1"),("1794", "4"),("102", "5"),("1822", "6"),("3382", "9");
ANALYZE table t1,t2;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze Warning Engine-independent statistics are not collected for column 'description'
test.t1 analyze status OK
test.t2 analyze status Engine-independent statistics collected
test.t2 analyze status OK
explain SELECT t2.id, t1.`label` FROM t2 INNER JOIN
(SELECT t1.id_object as id_object FROM t1 WHERE t1.`label` LIKE '%test%') AS lbl
ON (t2.id = lbl.id_object) INNER JOIN t1 ON (t2.id = t1.id_object);
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL id_object NULL NULL NULL 6 Using where 1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.id_object 1 1 SIMPLE t1 ref id_object id_object 5 test.t1.id_object 1
SELECT t2.id, t1.`label` FROM t2 INNER JOIN
(SELECT t1.id_object as id_object FROM t1 WHERE t1.`label` LIKE '%test%') AS lbl
ON (t2.id = lbl.id_object) INNER JOIN t1 ON (t2.id = t1.id_object);
id label 102 Le Pekin (Test) 1794 Test de resto 1822 Test 3 3382 Test 3524 Societe Test 3525 Fournisseur Test
drop table t1,t2;
create table t1 (a int, b varchar(200), c text not null) checksum=1 engine=myisam;
create table t2 (a int, b varchar(200), c text not null) checksum=0 engine=innodb;
create table t3 (a int, b varchar(200), c text not null) checksum=1 engine=innodb;
insert t1 values (1, "aaa", "bbb"), (NULL, "", "ccccc"), (0, NULL, "");
insert t2 select * from t1;
insert t3 select * from t1;
checksum table t1, t2, t3, t4 quick;
Table Checksum
test.t1 3442722830
test.t2 NULL
test.t3 NULL
test.t4 NULL
Warnings: Error1146 Table 'test.t4' doesn't exist
checksum table t1, t2, t3, t4;
Table Checksum
test.t1 3442722830
test.t2 3442722830
test.t3 3442722830
test.t4 NULL
Warnings: Error1146 Table 'test.t4' doesn't exist
checksum table t1, t2, t3, t4 extended;
Table Checksum
test.t1 3442722830
test.t2 3442722830
test.t3 3442722830
test.t4 NULL
Warnings: Error1146 Table 'test.t4' doesn't exist
drop table t1,t2,t3;
create table t1 (id int, name char(10) not null, name2 char(10) not null) engine=innodb;
insert into t1 values(1,'first','fff'),(2,'second','sss'),(3,'third','ttt');
select trim(name2) from t1 union all select trim(name) from t1 union all select trim(id) from t1;
trim(name2)
fff
sss
ttt
first
second
third 1 2 3
drop table t1;
create table t1 (a int) engine=innodb;
create table t2 like t1;
drop table t1,t2;
create table t1 (id int(11) not null, id2 int(11) not null, unique (id,id2)) engine=innodb;
create table t2 (id int(11) not null, constraint t1_id_fk foreign key ( id ) references t1 (id)) engine = innodb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`id` int(11) NOT NULL,
`id2` int(11) NOT NULL,
UNIQUE KEY `id` (`id`,`id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
KEY `t1_id_fk` (`id`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
create index id on t2 (id);
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
KEY `id` (`id`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
create index id2 on t2 (id);
Warnings:
Note 1831 Duplicate index `id2`. This is deprecated and will be disallowed in a future release
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
KEY `id` (`id`),
KEY `id2` (`id`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop index id2 on t2;
drop index id on t2; ERROR HY000: Cannot drop index 'id': needed in a foreign key constraint
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
KEY `id` (`id`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, constraint t1_id_fk foreign key (id,id2) references t1 (id,id2)) engine = innodb;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
`id2` int(11) NOT NULL,
KEY `t1_id_fk` (`id`,`id2`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`, `id2`) REFERENCES `t1` (`id`, `id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
create unique index id on t2 (id,id2);
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
`id2` int(11) NOT NULL,
UNIQUE KEY `id` (`id`,`id2`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`, `id2`) REFERENCES `t1` (`id`, `id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, unique (id,id2),constraint t1_id_fk foreign key (id2,id) references t1 (id,id2)) engine = innodb;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
`id2` int(11) NOT NULL,
UNIQUE KEY `id` (`id`,`id2`),
KEY `t1_id_fk` (`id2`,`id`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id2`, `id`) REFERENCES `t1` (`id`, `id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, unique (id,id2), constraint t1_id_fk foreign key (id) references t1 (id)) engine = innodb;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
`id2` int(11) NOT NULL,
UNIQUE KEY `id` (`id`,`id2`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, unique (id,id2),constraint t1_id_fk foreign key (id2,id) references t1 (id,id2)) engine = innodb;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
`id2` int(11) NOT NULL,
UNIQUE KEY `id` (`id`,`id2`),
KEY `t1_id_fk` (`id2`,`id`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id2`, `id`) REFERENCES `t1` (`id`, `id2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t2;
create table t2 (id int(11) not null auto_increment, id2 int(11) not null, constraint t1_id_fk foreign key (id) references t1 (id), primary key (id), index (id,id2)) engine = innodb;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`id2` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `id` (`id`,`id2`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t2;
create table t2 (id int(11) not null auto_increment, id2 int(11) not null, constraint t1_id_fk foreign key (id) references t1 (id)) engine= innodb;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`id2` int(11) NOT NULL,
KEY `t1_id_fk` (`id`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
alter table t2 add index id_test (id), add index id_test2 (id,id2);
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`id2` int(11) NOT NULL,
KEY `id_test` (`id`),
KEY `id_test2` (`id`,`id2`),
CONSTRAINT `t1_id_fk` FOREIGN KEY (`id`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t2;
create table t2 (id int(11) not null, id2 int(11) not null, constraint t1_id_fk foreign key (id2,id) references t1 (id)) engine = innodb; ERROR42000: Incorrect foreign key definition for 't1_id_fk': Key reference and table reference don't match
create table t2 (a int auto_increment primary key, b int, index(b), foreign key (b) references t1(id), unique(b)) engine=innodb;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`b` int(11) DEFAULT NULL,
PRIMARY KEY (`a`),
UNIQUE KEY `b_2` (`b`),
KEY `b` (`b`),
CONSTRAINT `1` FOREIGN KEY (`b`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t2;
create table t2 (a int auto_increment primary key, b int, foreign key (b) references t1(id), foreign key (b) references t1(id), unique(b)) engine=innodb;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`b` int(11) DEFAULT NULL,
PRIMARY KEY (`a`),
UNIQUE KEY `b` (`b`),
CONSTRAINT `1` FOREIGN KEY (`b`) REFERENCES `t1` (`id`),
CONSTRAINT `2` FOREIGN KEY (`b`) REFERENCES `t1` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t2, t1;
create table t1 (c char(10), index (c,c)) engine=innodb; ERROR42S21: Duplicate column name 'c'
create table t1 (c1 char(10), c2 char(10), index (c1,c2,c1)) engine=innodb; ERROR42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10), index (c1,c1,c2)) engine=innodb; ERROR42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10), index (c2,c1,c1)) engine=innodb; ERROR42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10)) engine=innodb;
alter table t1 add key (c1,c1); ERROR42S21: Duplicate column name 'c1'
alter table t1 add key (c2,c1,c1); ERROR42S21: Duplicate column name 'c1'
alter table t1 add key (c1,c2,c1); ERROR42S21: Duplicate column name 'c1'
alter table t1 add key (c1,c1,c2); ERROR42S21: Duplicate column name 'c1'
drop table t1;
create table t1(a int(1) , b int(1)) engine=innodb;
insert into t1 values ('1111', '3333');
select distinct concat(a, b) from t1;
concat(a, b) 11113333
drop table t1;
CREATE TABLE t1 (a_id tinyint(4) NOT NULL default '0', PRIMARY KEY (a_id)) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t1 VALUES (1),(2),(3);
CREATE TABLE t2 (b_id tinyint(4) NOT NULL default '0',b_a tinyint(4) NOT NULL default '0', PRIMARY KEY (b_id), KEY (b_a),
CONSTRAINT fk_b_a FOREIGN KEY (b_a) REFERENCES t1 (a_id) ON DELETE CASCADE ON UPDATE NO ACTION) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO t2 VALUES (1,1),(2,1),(3,1),(4,2),(5,2);
SELECT * FROM (SELECT t1.*,GROUP_CONCAT(t2.b_id SEPARATOR ',') as b_list FROM (t1 LEFT JOIN (t2) on t1.a_id = t2.b_a) GROUP BY t1.a_id ) AS xyz;
a_id b_list 11,2,3 24,5 3 NULL
DROP TABLE t2;
DROP TABLE t1;
create temporary table t1 (a int) engine=innodb;
insert into t1 values (4711);
truncate t1;
insert into t1 values (42);
select * from t1;
a 42
drop table t1;
create table t1 (a int) engine=innodb;
insert into t1 values (4711);
truncate t1;
insert into t1 values (42);
select * from t1;
a 42
drop table t1;
create table t1 (a int not null, b int not null, c blob not null, d int not null, e int, primary key (a,b,c(255),d)) engine=innodb;
insert into t1 values (2,2,"b",2,2),(1,1,"a",1,1),(3,3,"ab",3,3);
analyze table t1;
select * from t1 order by a,b,c,d;
a b c d e 11 a 11 22 b 22 33 ab 33
explain select * from t1 order by a,b,c,d;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort
drop table t1;
create table t1 (a char(1), b char(1), key(a, b)) engine=innodb;
insert into t1 values ('8', '6'), ('4', '7');
select min(a) from t1; min(a) 4
select min(b) from t1 where a='8'; min(b) 6
drop table t1;
create table t1 (x bigint unsigned not null primary key) engine=innodb;
insert into t1(x) values (0xfffffffffffffff0),(0xfffffffffffffff1);
select * from t1;
x 18446744073709551600 18446744073709551601
select count(*) from t1 where x>0;
count(*) 2
select count(*) from t1 where x=0;
count(*) 0
select count(*) from t1 where x<0;
count(*) 0
select count(*) from t1 where x < -16;
count(*) 0
select count(*) from t1 where x = -16;
count(*) 0
explain select count(*) from t1 where x > -16;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 2 Using where
select count(*) from t1 where x > -16;
count(*) 2
select * from t1 where x > -16;
x 18446744073709551600 18446744073709551601
select count(*) from t1 where x = 18446744073709551601;
count(*) 1
drop table t1;
SELECT IF(variable_value BETWEEN 488AND512, 'OK', variable_value) FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_buffer_pool_pages_total'; IF(variable_value BETWEEN 488AND512, 'OK', variable_value)
OK
SELECT variable_value FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_page_size';
variable_value 16384
SELECT variable_value - @innodb_row_lock_waits_orig FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_row_lock_waits';
variable_value - @innodb_row_lock_waits_orig 0
SELECT variable_value - @innodb_row_lock_current_waits_orig FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_row_lock_current_waits';
variable_value - @innodb_row_lock_current_waits_orig 0
SELECT variable_value - @innodb_row_lock_time_orig FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_row_lock_time';
variable_value - @innodb_row_lock_time_orig 0
SELECT variable_value - @innodb_row_lock_time_max_orig FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_row_lock_time_max';
variable_value - @innodb_row_lock_time_max_orig 0
SELECT variable_value - @innodb_row_lock_time_avg_orig FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_row_lock_time_avg';
variable_value - @innodb_row_lock_time_avg_orig 0 set default_storage_engine=INNODB;
drop table if exists t1,t2,t3;
--- Testing varchar ---
--- Testing varchar ---
create table t1 (v varchar(10), c char(10), t text);
insert into t1 values('+ ', '+ ', '+ '); set @a=repeat(' ',20);
insert into t1 values (concat('+',@a),concat('+',@a),concat('+',@a));
Warnings:
Note 1265 Data truncated for column 'v' at row 1
select concat('*',v,'*',c,'*',t,'*') from t1;
concat('*',v,'*',c,'*',t,'*')
*+ *+*+ *
*+ *+*+ *
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) DEFAULT NULL,
`c` char(10) DEFAULT NULL,
`t` text DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
create table t2 like t1;
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`v` varchar(10) DEFAULT NULL,
`c` char(10) DEFAULT NULL,
`t` text DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
create table t3 select * from t1;
show create table t3;
Table Create Table
t3 CREATE TABLE `t3` (
`v` varchar(10) DEFAULT NULL,
`c` char(10) DEFAULT NULL,
`t` text DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
alter table t1 modify c varchar(10);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) DEFAULT NULL,
`c` varchar(10) DEFAULT NULL,
`t` text DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
alter table t1 modify v char(10);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` char(10) DEFAULT NULL,
`c` varchar(10) DEFAULT NULL,
`t` text DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
alter table t1 modify t varchar(10);
Warnings:
Note 1265 Data truncated for column 't' at row 2
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` char(10) DEFAULT NULL,
`c` varchar(10) DEFAULT NULL,
`t` varchar(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
select concat('*',v,'*',c,'*',t,'*') from t1;
concat('*',v,'*',c,'*',t,'*')
*+*+*+ *
*+*+*+ *
drop table t1,t2,t3;
create table t1 (v varchar(10), c char(10), t text, key(v), key(c), key(t(10)));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) DEFAULT NULL,
`c` char(10) DEFAULT NULL,
`t` text DEFAULT NULL,
KEY `v` (`v`),
KEY `c` (`c`),
KEY `t` (`t`(10))
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
select count(*) from t1;
count(*) 270
insert into t1 values(concat('a',char(1)),concat('a',char(1)),concat('a',char(1)));
select count(*) from t1 where v='a';
count(*) 10
select count(*) from t1 where c='a';
count(*) 10
select count(*) from t1 where t='a';
count(*) 10
select count(*) from t1 where v='a ';
count(*) 10
select count(*) from t1 where c='a ';
count(*) 10
select count(*) from t1 where t='a ';
count(*) 10
select count(*) from t1 where v between 'a'and'a ';
count(*) 10
select count(*) from t1 where v between 'a'and'a 'and v between 'a 'and'b\n';
count(*) 10
select count(*) from t1 where v like 'a%';
count(*) 11
select count(*) from t1 where c like 'a%';
count(*) 11
select count(*) from t1 where t like 'a%';
count(*) 11
select count(*) from t1 where v like 'a %';
count(*) 9
explain select count(*) from t1 where v='a ';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 13 const # Using where; Using index
explain select count(*) from t1 where c='a ';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref c c 11 const # Using where; Using index
explain select count(*) from t1 where t='a ';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref t t 13 const # Using where
explain select count(*) from t1 where v like 'a%';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range v v 13 NULL # Using where; Using index
explain select count(*) from t1 where v between 'a'and'a ';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 13 const # Using where; Using index
explain select count(*) from t1 where v between 'a'and'a 'and v between 'a 'and'b\n';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 13 const # Using where; Using index
alter table t1 add unique(v); ERROR23000: Duplicate entry 'v' for key 'v_2'
alter table t1 add key(v);
Warnings:
Note 1831 Duplicate index `v_2`. This is deprecated and will be disallowed in a future release
select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a';
qq
*a*a*a*
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
*a *a*a *
explain select * from t1 where v='a';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v,v_2 # 13 const # #
select v,count(*) from t1 group by v limit 10;
v count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(c) from t1 group by v limit 10;
v count(c)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(c) from t1 group by v limit 10;
v count(c)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select c,count(*) from t1 group by c limit 10;
c count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select c,count(t) from t1 group by c limit 10;
c count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result c,count(t) from t1 group by c limit 10;
c count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select t,count(*) from t1 group by t limit 10;
t count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select t,count(t) from t1 group by t limit 10;
t count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result t,count(t) from t1 group by t limit 10;
t count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
alter table t1 modify v varchar(300), drop key v, drop key v_2, add key v (v);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(300) DEFAULT NULL,
`c` char(10) DEFAULT NULL,
`t` text DEFAULT NULL,
KEY `c` (`c`),
KEY `t` (`t`(10)),
KEY `v` (`v`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
select count(*) from t1 where v='a';
count(*) 10
select count(*) from t1 where v='a ';
count(*) 10
select count(*) from t1 where v between 'a'and'a ';
count(*) 10
select count(*) from t1 where v between 'a'and'a 'and v between 'a 'and'b\n';
count(*) 10
select count(*) from t1 where v like 'a%';
count(*) 11
select count(*) from t1 where v like 'a %';
count(*) 9
explain select count(*) from t1 where v='a ';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 303 const # Using where; Using index
explain select count(*) from t1 where v like 'a%';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range v v 303 NULL # Using where; Using index
explain select count(*) from t1 where v between 'a'and'a ';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 303 const # Using where; Using index
explain select count(*) from t1 where v between 'a'and'a 'and v between 'a 'and'b\n';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 303 const # Using where; Using index
explain select * from t1 where v='a';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 303 const # #
select v,count(*) from t1 group by v limit 10;
v count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
alter table t1 drop key v, add key v (v(30));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(300) DEFAULT NULL,
`c` char(10) DEFAULT NULL,
`t` text DEFAULT NULL,
KEY `c` (`c`),
KEY `t` (`t`(10)),
KEY `v` (`v`(30))
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
select count(*) from t1 where v='a';
count(*) 10
select count(*) from t1 where v='a ';
count(*) 10
select count(*) from t1 where v between 'a'and'a ';
count(*) 10
select count(*) from t1 where v between 'a'and'a 'and v between 'a 'and'b\n';
count(*) 10
select count(*) from t1 where v like 'a%';
count(*) 11
select count(*) from t1 where v like 'a %';
count(*) 9
explain select count(*) from t1 where v='a ';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 33 const # Using where
explain select count(*) from t1 where v like 'a%';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range v v 33 NULL # Using where
explain select count(*) from t1 where v between 'a'and'a ';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 33 const # Using where
explain select count(*) from t1 where v between 'a'and'a 'and v between 'a 'and'b\n';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 33 const # Using where
explain select * from t1 where v='a';
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref v v 33 const # #
select v,count(*) from t1 group by v limit 10;
v count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
alter table t1 modify v varchar(600), drop key v, add key v (v);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(600) DEFAULT NULL,
`c` char(10) DEFAULT NULL,
`t` text DEFAULT NULL,
KEY `c` (`c`),
KEY `t` (`t`(10)),
KEY `v` (`v`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
select v,count(*) from t1 group by v limit 10;
v count(*)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
select sql_big_result v,count(t) from t1 group by v limit 10;
v count(t)
a 1
a 10
b 10
c 10
d 10
e 10
f 10
g 10
h 10
i 10
drop table t1;
create table t1 (a char(10), unique (a));
insert into t1 values ('a ');
insert into t1 values ('a '); ERROR23000: Duplicate entry 'a' for key 'a'
alter table t1 modify a varchar(10);
insert into t1 values ('a '),('a '),('a '),('a '); ERROR23000: Duplicate entry 'a ' for key 'a'
insert into t1 values ('a '); ERROR23000: Duplicate entry 'a ' for key 'a'
insert into t1 values ('a '); ERROR23000: Duplicate entry 'a ' for key 'a'
insert into t1 values ('a '); ERROR23000: Duplicate entry 'a ' for key 'a'
update t1 set a='a ' where a like 'a%';
select concat(a,'.') from t1;
concat(a,'.')
a .
update t1 set a='abc ' where a like 'a ';
select concat(a,'.') from t1;
concat(a,'.')
a .
update t1 set a='a ' where a like 'a %';
select concat(a,'.') from t1;
concat(a,'.')
a .
update t1 set a='a ' where a like 'a ';
select concat(a,'.') from t1;
concat(a,'.')
a .
drop table t1;
create table t1 (v varchar(10), c char(10), t text, key(v(5)), key(c(5)), key(t(5)));
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) DEFAULT NULL,
`c` char(10) DEFAULT NULL,
`t` text DEFAULT NULL,
KEY `v` (`v`(5)),
KEY `c` (`c`(5)),
KEY `t` (`t`(5))
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
create table t1 (v char(10) character set utf8);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` char(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_uca1400_ai_ci DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
create table t1 (v varchar(10), c char(10)) row_format=fixed;
Warnings:
Warning 1478 InnoDB: assuming ROW_FORMAT=DYNAMIC.
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` varchar(10) DEFAULT NULL,
`c` char(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci ROW_FORMAT=FIXED
insert into t1 values('a','a'),('a ','a ');
select concat('*',v,'*',c,'*') from t1;
concat('*',v,'*',c,'*')
*a*a*
*a *a*
drop table t1;
create table t1 (v varchar(65530), key(v(10)));
insert into t1 values(repeat('a',65530));
select length(v) from t1 where v=repeat('a',65530);
length(v) 65530
drop table t1;
create table t1(a int, b varchar(12), key ba(b, a));
insert into t1 values (1, 'A'), (20, NULL);
explain select * from t1 where a=20and b is null;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref ba ba 20 const,const 1 Using where; Using index
select * from t1 where a=20and b is null;
a b 20 NULL
drop table t1; SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
create table t1 (v varchar(65530), key(v));
Warnings:
Note 1071 Specified key was too long; max key length is 3072 bytes
drop table t1;
create table t1 (v varchar(65536));
Warnings:
Note 1246 Converting column 'v' from VARCHAR to TEXT
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` mediumtext DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
create table t1 (v varchar(65530) character set utf8);
Warnings:
Note 1246 Converting column 'v' from VARCHAR to TEXT
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v` mediumtext CHARACTER SET utf8mb4 COLLATE utf8mb4_uca1400_ai_ci DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1; SET sql_mode = default; set default_storage_engine=MyISAM;
create table t1 (v varchar(16384)) engine=innodb;
drop table t1;
create table t1 (a char(1), b char(1), key(a, b)) engine=innodb;
insert into t1 values ('8', '6'), ('4', '7');
select min(a) from t1; min(a) 4
select min(b) from t1 where a='8'; min(b) 6
drop table t1;
CREATE TABLE t1 ( `a` int(11) NOT NULL auto_increment, `b` int(11) default NULL,PRIMARY KEY (`a`),UNIQUE KEY `b` (`b`)) ENGINE=innodb;
insert into t1 (b) values (1); replace into t1 (b) values (2), (1), (3);
select * from t1;
a b 31 22 43
truncate table t1;
insert into t1 (b) values (1); replace into t1 (b) values (2); replace into t1 (b) values (1); replace into t1 (b) values (3);
select * from t1;
a b 31 22 43
drop table t1;
create table t1 (rowid int not null auto_increment, val int not null,primary
key (rowid), unique(val)) engine=innodb; replace into t1 (val) values ('1'),('2'); replace into t1 (val) values ('1'),('2');
insert into t1 (val) values ('1'),('2'); ERROR23000: Duplicate entry '1' for key 'val'
select * from t1;
rowid val 31 42
drop table t1;
create table t1 (a int not null auto_increment primary key, val int) engine=InnoDB;
insert into t1 (val) values (1);
update t1 set a=2 where a=1;
insert into t1 (val) values (3);
select * from t1;
a val 21 33
insert into t1 values (2, 2); ERROR23000: Duplicate entry '2' for key 'PRIMARY'
select * from t1;
a val 21 33
drop table t1;
CREATE TABLE t1 (GRADE DECIMAL(4) NOT NULL, PRIMARY KEY (GRADE)) ENGINE=INNODB;
INSERT INTO t1 (GRADE) VALUES (151),(252),(343);
SELECT GRADE FROM t1 WHERE GRADE > 160AND GRADE < 300;
GRADE 252
SELECT GRADE FROM t1 WHERE GRADE= 151;
GRADE 151
DROP TABLE t1;
create table t1 (f1 varchar(10), f2 varchar(10), primary key (f1,f2)) engine=innodb;
create table t2 (f3 varchar(10), f4 varchar(10), key (f4)) engine=innodb;
insert into t2 values ('aa','cc');
insert into t1 values ('aa','bb'),('aa','cc');
delete t1 from t1,t2 where f1=f3 and f4='cc';
select * from t1;
f1 f2
drop table t1,t2;
CREATE TABLE t1 (
id INTEGER NOT NULL AUTO_INCREMENT, PRIMARY KEY (id)
) ENGINE=InnoDB;
CREATE TABLE t2 (
id INTEGER NOT NULL,
FOREIGN KEY (id) REFERENCES t1 (id)
) ENGINE=InnoDB;
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
id 1
TRUNCATE t1; ERROR42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`id`) REFERENCES `test`.`t1` (`id`))
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
id 1 2
DELETE FROM t1;
TRUNCATE t1; ERROR42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`id`) REFERENCES `test`.`t1` (`id`))
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
id 3
DROP TABLE t2;
TRUNCATE t1;
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
id 1
DROP TABLE t1;
CREATE TABLE t1
(
id INT PRIMARY KEY
) ENGINE=InnoDB;
CREATE TEMPORARY TABLE t2
(
id INT NOT NULL PRIMARY KEY,
b INT,
FOREIGN KEY (b) REFERENCES test.t1(id)
) ENGINE=InnoDB; ERROR HY000: Can't create table `test`.`t2` (errno: 150 "Foreign key constraint is incorrectly formed")
DROP TABLE t1;
create table t1 (col1 varchar(2000), index (col1(767)))
character set = latin1 engine = innodb;
create table t2 (col1 char(255), index (col1))
character set = latin1 engine = innodb;
create table t3 (col1 binary(255), index (col1))
character set = latin1 engine = innodb;
create table t4 (col1 varchar(767), index (col1))
character set = latin1 engine = innodb;
create table t5 (col1 varchar(767) primary key)
character set = latin1 engine = innodb;
create table t6 (col1 varbinary(767) primary key)
character set = latin1 engine = innodb;
create table t7 (col1 text, index(col1(767)))
character set = latin1 engine = innodb;
create table t8 (col1 blob, index(col1(767)))
character set = latin1 engine = innodb;
create table t9 (col1 varchar(512), col2 varchar(512), index(col1, col2))
character set = latin1 engine = innodb;
show create table t9;
Table Create Table
t9 CREATE TABLE `t9` (
`col1` varchar(512) DEFAULT NULL,
`col2` varchar(512) DEFAULT NULL,
KEY `col1` (`col1`,`col2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1, t2, t3, t4, t5, t6, t7, t8, t9;
CREATE TABLE t1
(
id INT PRIMARY KEY
) ENGINE=InnoDB;
CREATE TABLE t2
(
v INT,
CONSTRAINT c1 FOREIGN KEY (v) REFERENCES t1(id)
) ENGINE=InnoDB;
INSERT INTO t2 VALUES(2); ERROR23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c1` FOREIGN KEY (`v`) REFERENCES `t1` (`id`))
INSERT INTO t1 VALUES(1);
INSERT INTO t2 VALUES(1);
DELETE FROM t1 WHERE id = 1; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c1` FOREIGN KEY (`v`) REFERENCES `t1` (`id`))
DROP TABLE t1; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails SET FOREIGN_KEY_CHECKS=0;
DROP TABLE t1; SET FOREIGN_KEY_CHECKS=1;
INSERT INTO t2 VALUES(3); ERROR23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c1` FOREIGN KEY (`v`) REFERENCES `t1` (`id`))
DROP TABLE t2;
connect a,localhost,root,,;
connect b,localhost,root,,;
connection a;
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1),(2); set autocommit=0;
checksum table t1;
Table Checksum
test.t1 1531596814
connection b;
insert into t1 values(3);
connection a;
checksum table t1;
Table Checksum
test.t1 1531596814
connection a;
commit;
checksum table t1;
Table Checksum
test.t1 2050879373
commit;
drop table t1;
connection a;
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1),(2); set autocommit=1;
checksum table t1;
Table Checksum
test.t1 1531596814
connection b; set autocommit=1;
insert into t1 values(3);
connection a;
checksum table t1;
Table Checksum
test.t1 2050879373
drop table t1;
connection default;
disconnect a;
disconnect b; set foreign_key_checks=0;
create table t2 (a int primary key, b int, foreign key (b) references t1(a)) engine = innodb;
create table t1(a char(10) primary key, b varchar(20)) engine = innodb; set foreign_key_checks=1;
insert into t2 values (1,1); ERROR23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`b`) REFERENCES `t1` (`a`)) set foreign_key_checks=0;
drop table t1; set foreign_key_checks=1;
insert into t2 values (1,1); ERROR23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`b`) REFERENCES `t1` (`a`))
create table t1(a char(10) primary key, b varchar(20)) engine = innodb; ERROR HY000: Can't create table `test`.`t1` (errno: 150 "Foreign key constraint is incorrectly formed")
drop table t2;
create table t1(a char(10) primary key, b varchar(20)) engine = innodb;
drop table t1; set foreign_key_checks=0;
create table t1(a varchar(10) primary key) engine = innodb DEFAULT CHARSET=latin1;
create table t2 (a varchar(10), foreign key (a) references t1(a)) engine = innodb DEFAULT CHARSET=utf8; ERROR HY000: Can't create table `test`.`t2` (errno: 150 "Foreign key constraint is incorrectly formed") set foreign_key_checks=1;
drop table t1; set foreign_key_checks=0;
create table t2 (a varchar(10), foreign key (a) references t1(a)) engine = innodb;
create table t1(a varchar(10) primary key) engine = innodb;
alter table t1 modify column a int; ERROR HY000: Cannot change column 'a': used in a foreign key constraint '1' of table 'test.t2' set foreign_key_checks=1;
drop table t2,t1; set foreign_key_checks=0;
create table t2 (a varchar(10), foreign key (a) references t1(a)) engine = innodb DEFAULT CHARSET=latin1;
create table t1(a varchar(10) primary key) engine = innodb DEFAULT CHARSET=latin1;
alter table t1 convert to character set utf8; ERROR HY000: Cannot change column 'a': used in a foreign key constraint '1' of table 'test.t2' set foreign_key_checks=1;
drop table t2,t1;
call mtr.add_suppression("\\[Warning\\] InnoDB: In ALTER TABLE `test`.`t1` has or is referenced in foreign key constraints which are not compatible with the new table definition."); set foreign_key_checks=0;
create table t2 (a varchar(10), foreign key (a) references t1(a)) engine = innodb DEFAULT CHARSET=latin1;
create table t3(a varchar(10) primary key) engine = innodb DEFAULT CHARSET=utf8;
rename table t3 to t1; ERROR HY000: Error on rename of './test/t3' to './test/t1' (errno: 150"Foreign key constraint is incorrectly formed") set foreign_key_checks=1;
drop table t2,t3;
create table t1(a int primary key) row_format=redundant engine=innodb;
create table t2(a int primary key,constraint foreign key(a)references t1(a)) row_format=compact engine=innodb;
create table t3(a int primary key) row_format=compact engine=innodb;
create table t4(a int primary key,constraint foreign key(a)references t3(a)) row_format=redundant engine=innodb;
insert into t1 values(1);
insert into t3 values(1);
insert into t2 values(2); ERROR23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
insert into t4 values(2); ERROR23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
insert into t2 values(1);
insert into t4 values(1);
update t1 set a=2; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
update t2 set a=2; ERROR23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
update t3 set a=2; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
update t4 set a=2; ERROR23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
truncate t1; ERROR42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `test`.`t1` (`a`))
truncate t3; ERROR42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t4`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `test`.`t3` (`a`))
truncate t2;
truncate t4;
truncate t1; ERROR42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `test`.`t1` (`a`))
truncate t3; ERROR42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t4`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `test`.`t3` (`a`))
drop table t4,t3,t2,t1;
create table t1 (a varchar(255) character set utf8mb3,
b varchar(255) character set utf8mb3,
c varchar(255) character set utf8mb3,
d varchar(255) character set utf8mb3,
key (a,b,c,d)) engine=innodb;
drop table t1;
create table t1 (a varchar(255) character set utf8mb3,
b varchar(255) character set utf8mb3,
c varchar(255) character set utf8mb3,
d varchar(255) character set utf8mb3,
e varchar(255) character set utf8mb3,
key (a,b,c,d,e)) engine=innodb; ERROR42000: Specified key was too long; max key length is 3072 bytes SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
create table t1 (s1 varbinary(2),primary key (s1)) engine=innodb;
create table t2 (s1 binary(2),primary key (s1)) engine=innodb;
create table t3 (s1 varchar(2) binary,primary key (s1)) engine=innodb;
create table t4 (s1 char(2) binary,primary key (s1)) engine=innodb;
insert into t1 values (0x41),(0x4120),(0x4100);
insert into t2 values (0x41),(0x4120),(0x4100); ERROR23000: Duplicate entry 'A' for key 'PRIMARY'
insert into t2 values (0x41),(0x4120);
insert into t3 values (0x41),(0x4120),(0x4100); ERROR23000: Duplicate entry 'A ' for key 'PRIMARY'
insert into t3 values (0x41),(0x4100);
insert into t4 values (0x41),(0x4120),(0x4100); ERROR23000: Duplicate entry 'A' for key 'PRIMARY'
insert into t4 values (0x41),(0x4100);
select hex(s1) from t1;
hex(s1) 41 4100 4120
select hex(s1) from t2;
hex(s1) 4100 4120
select hex(s1) from t3;
hex(s1) 4100 41
select hex(s1) from t4;
hex(s1) 4100 41
drop table t1,t2,t3,t4;
create table t1 (a int primary key,s1 varbinary(3) not null unique) engine=innodb;
create table t2 (s1 binary(2) not null, constraint c foreign key(s1) references t1(s1) on update cascade) engine=innodb;
insert into t1 values(1,0x4100),(2,0x41),(3,0x4120),(4,0x42);
insert into t2 values(0x42); ERROR23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
insert into t2 values(0x41);
select hex(s1) from t2;
hex(s1) 4100
update t1 set s1=0x123456 where a=2;
select hex(s1) from t2;
hex(s1) 4100
update t1 set s1=0x12 where a=1; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
update t1 set s1=0x12345678 where a=1; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
update t1 set s1=0x123457 where a=1; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
update t1 set s1=0x1220 where a=1;
select hex(s1) from t2;
hex(s1) 1220
update t1 set s1=0x1200 where a=1;
select hex(s1) from t2;
hex(s1) 1200
update t1 set s1=0x4200 where a=1;
select hex(s1) from t2;
hex(s1) 4200
delete from t1 where a=1; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
delete from t1 where a=2;
update t2 set s1=0x4120;
delete from t1; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
delete from t1 where a!=3;
select a,hex(s1) from t1;
a hex(s1) 34120
select hex(s1) from t2;
hex(s1) 4120
drop table t2,t1;
create table t1 (a int primary key,s1 varchar(2) binary not null unique) engine=innodb;
create table t2 (s1 char(2) binary not null, constraint c foreign key(s1) references t1(s1) on update cascade) engine=innodb;
insert into t1 values(1,0x4100),(2,0x41);
insert into t2 values(0x41);
select hex(s1) from t2;
hex(s1) 41
update t1 set s1=0x1234 where a=1;
select hex(s1) from t2;
hex(s1) 41
update t1 set s1=0x12 where a=2;
select hex(s1) from t2;
hex(s1) 12
delete from t1 where a=1;
delete from t1 where a=2; ERROR23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `c` FOREIGN KEY (`s1`) REFERENCES `t1` (`s1`) ON UPDATE CASCADE)
select a,hex(s1) from t1;
a hex(s1) 212
select hex(s1) from t2;
hex(s1) 12
drop table t2,t1;
CREATE TABLE t1(a INT, PRIMARY KEY(a)) ENGINE=InnoDB;
CREATE TABLE t2(a INT) ENGINE=InnoDB;
ALTER TABLE t2 ADD FOREIGN KEY (a) REFERENCES t1(a);
ALTER TABLE t2 DROP FOREIGN KEY `1`;
ALTER TABLE t2 ADD CONSTRAINT `0` FOREIGN KEY (a) REFERENCES t1(a);
ALTER TABLE t2 DROP FOREIGN KEY `0`;
SHOW CREATE TABLE t2;
Table Create Table
t2 CREATE TABLE `t2` (
`a` int(11) DEFAULT NULL,
KEY `0` (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
DROP TABLE t2,t1; SET sql_mode = default;
CREATE TABLE t1 (
field1 varchar(8) NOT NULL DEFAULT '',
field2 varchar(8) NOT NULL DEFAULT '',
PRIMARY KEY (field1, field2)
) ENGINE=InnoDB;
CREATE TABLE t2 (
field1 varchar(8) NOT NULL DEFAULT '' PRIMARY KEY,
FOREIGN KEY (field1) REFERENCES t1 (field1)
ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB;
INSERT INTO t1 VALUES ('old', 'somevalu');
INSERT INTO t1 VALUES ('other', 'anyvalue');
INSERT INTO t2 VALUES ('old');
INSERT INTO t2 VALUES ('other');
UPDATE t1 SET field1 = 'other' WHERE field2 = 'somevalu'; ERROR23000: Foreign key constraint for table 't1', record 'other-somevalu' would lead to a duplicate entry in table 't2', key 'PRIMARY'
DROP TABLE t2;
DROP TABLE t1;
create table t1 (
c1 bigint not null,
c2 bigint not null,
primary key (c1),
unique key (c2)
) engine=innodb;
create table t2 (
c1 bigint not null,
primary key (c1)
) engine=innodb;
alter table t1 add constraint c2_fk foreign key (c2)
references t2(c1) on delete cascade;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` bigint(20) NOT NULL,
`c2` bigint(20) NOT NULL,
PRIMARY KEY (`c1`),
UNIQUE KEY `c2` (`c2`),
CONSTRAINT `c2_fk` FOREIGN KEY (`c2`) REFERENCES `t2` (`c1`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
alter table t1 drop foreign key c2_fk;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` bigint(20) NOT NULL,
`c2` bigint(20) NOT NULL,
PRIMARY KEY (`c1`),
UNIQUE KEY `c2` (`c2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1, t2;
create table t1(a date) engine=innodb;
create table t2(a date, key(a)) engine=innodb;
insert into t1 values('2005-10-01');
insert into t2 values('2005-10-01');
select * from t1, t2
where t2.a between t1.a - interval 2 day and t1.a + interval 2 day;
a a 2005-10-012005-10-01
drop table t1, t2;
create table t1 (id int not null, f_id int not null, f int not null,
primary key(f_id, id)) engine=innodb;
create table t2 (id int not null,s_id int not null,s varchar(200),
primary key(id)) engine=innodb;
INSERT INTO t1 VALUES (8, 1, 3);
INSERT INTO t1 VALUES (1, 2, 1);
INSERT INTO t2 VALUES (1, 0, '');
INSERT INTO t2 VALUES (8, 1, '');
commit;
DELETE ml.* FROM t1 AS ml LEFT JOIN t2 AS mm ON (mm.id=ml.id)
WHERE mm.id IS NULL;
select ml.* from t1 as ml left join t2 as mm on (mm.id=ml.id)
where mm.id is null lock in share mode;
id f_id f
drop table t1,t2;
connect a,localhost,root,,;
connect b,localhost,root,,;
connection a;
create table t1(a int not null, b int, primary key(a)) engine=innodb;
insert into t1 values(1,1),(2,2),(3,1),(4,2),(5,1),(6,2),(7,3);
commit; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
update t1 set b = 5 where b = 1;
connection b; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
select * from t1 where a = 7and b = 3 for update;
a b 73
connection a;
commit;
connection b;
commit;
drop table t1;
connection default;
disconnect a;
disconnect b;
connect a,localhost,root,,;
connect b,localhost,root,,;
connection a;
create table t1(a int not null, b int, primary key(a)) engine=innodb;
insert into t1 values(1,1),(2,2),(3,1),(4,2),(5,1),(6,2);
commit; set autocommit = 0;
select * from t1 lock in share mode;
a b 11 22 31 42 51 62
update t1 set b = 5 where b = 1;
connection b; set autocommit = 0;
select * from t1 where a = 2and b = 2 for update; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection a;
commit;
connection b;
commit;
connection default;
disconnect a;
disconnect b;
drop table t1;
connect a,localhost,root,,;
connect b,localhost,root,,;
connection a;
create table t1(a int not null, b int, primary key(a)) engine=innodb;
insert into t1 values (1,2),(5,3),(4,2);
create table t2(d int not null, e int, primary key(d)) engine=innodb;
insert into t2 values (8,6),(12,1),(3,1);
commit; set autocommit = 0;
select * from t2 for update;
d e 31 86 121
connection b; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
insert into t1 select * from t2;
update t1 set b = (select e from t2 where a = d);
create table t3(d int not null, e int, primary key(d)) engine=innodb
select * from t2;
commit;
connection a;
commit;
connection default;
disconnect a;
disconnect b;
drop table t1, t2, t3;
connect a,localhost,root,,;
connect b,localhost,root,,;
connect c,localhost,root,,;
connect d,localhost,root,,;
connect e,localhost,root,,;
connect f,localhost,root,,;
connect g,localhost,root,,;
connect h,localhost,root,,;
connect i,localhost,root,,;
connect j,localhost,root,,;
connection a;
create table t1(a int not null, b int, primary key(a)) engine=innodb;
insert into t1 values (1,2),(5,3),(4,2);
create table t2(a int not null, b int, primary key(a)) engine=innodb;
insert into t2 values (8,6),(12,1),(3,1);
create table t3(d int not null, b int, primary key(d)) engine=innodb;
insert into t3 values (8,6),(12,1),(3,1);
create table t5(a int not null, b int, primary key(a)) engine=innodb;
insert into t5 values (1,2),(5,3),(4,2);
create table t6(d int not null, e int, primary key(d)) engine=innodb;
insert into t6 values (8,6),(12,1),(3,1);
create table t8(a int not null, b int, primary key(a)) engine=innodb;
insert into t8 values (1,2),(5,3),(4,2);
create table t9(d int not null, e int, primary key(d)) engine=innodb;
insert into t9 values (8,6),(12,1),(3,1);
commit; set autocommit = 0;
select * from t2 for update;
a b 31 86 121
connection b; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
insert into t1 select * from t2;
connection c; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
update t3 set b = (select b from t2 where a = d);
connection d; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
create table t4(a int not null, b int, primary key(a)) engine=innodb select * from t2;
connection e; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
insert into t5 (select * from t2 lock in share mode);
connection f; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
update t6 set e = (select b from t2 where a = d lock in share mode);
connection g; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
create table t7(a int not null, b int, primary key(a)) engine=innodb select * from t2 lock in share mode;
connection h; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
insert into t8 (select * from t2 for update);
connection i; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
update t9 set e = (select b from t2 where a = d for update);
connection j; SET binlog_format='MIXED'; set autocommit = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
create table t10(a int not null, b int, primary key(a)) engine=innodb select * from t2 for update;
connection b; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection c; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection d; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection e; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection f; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection g; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection h; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection i; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection j; ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection a;
commit;
connection default;
disconnect a;
disconnect b;
disconnect c;
disconnect d;
disconnect e;
disconnect f;
disconnect g;
disconnect h;
disconnect i;
disconnect j;
drop table t1, t2, t3, t5, t6, t8, t9;
CREATE TABLE t1 (DB_ROW_ID int) engine=innodb; ERROR42000: Incorrect column name 'DB_ROW_ID'
CREATE TABLE t1 (
a BIGINT(20) NOT NULL,
PRIMARY KEY (a)
) ENGINE=INNODB DEFAULT CHARSET=UTF8;
CREATE TABLE t2 (
a BIGINT(20) NOT NULL,
b VARCHAR(128) NOT NULL,
c TEXT NOT NULL,
PRIMARY KEY (a,b),
KEY idx_t2_b_c (b,c(100)),
CONSTRAINT t_fk FOREIGN KEY (a) REFERENCES t1 (a)
ON DELETE CASCADE
) ENGINE=INNODB DEFAULT CHARSET=UTF8;
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (1, 'bar', 'vbar');
INSERT INTO t2 VALUES (1, 'BAR2', 'VBAR');
INSERT INTO t2 VALUES (1, 'bar_bar', 'bibi');
INSERT INTO t2 VALUES (1, 'customer_over', '1');
SELECT * FROM t2 WHERE b = 'customer_over';
a b c 1 customer_over 1
SELECT * FROM t2 WHERE BINARY b = 'customer_over';
a b c 1 customer_over 1
SELECT DISTINCT p0.a FROM t2 p0 WHERE p0.b = 'customer_over';
a 1 /* Bang: Empty result set, above was expected: */
SELECT DISTINCT p0.a FROM t2 p0 WHERE BINARY p0.b = 'customer_over';
a 1
SELECT p0.a FROM t2 p0 WHERE BINARY p0.b = 'customer_over';
a 1
drop table t2, t1;
CREATE TABLE t1 ( a int ) ENGINE=innodb;
BEGIN;
INSERT INTO t1 VALUES (1);
OPTIMIZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 optimize note Table does not support optimize, doing recreate + analyze instead
test.t1 optimize status OK
DROP TABLE t1;
CREATE TABLE t1 (id int PRIMARY KEY, f int NOT NULL, INDEX(f)) ENGINE=InnoDB;
CREATE TABLE t2 (id int PRIMARY KEY, f INT NOT NULL,
CONSTRAINT t2_t1 FOREIGN KEY (id) REFERENCES t1 (id)
ON DELETE CASCADE ON UPDATE CASCADE) ENGINE=InnoDB;
ALTER TABLE t2 ADD FOREIGN KEY (f) REFERENCES t1 (f) ON
DELETE CASCADE ON UPDATE CASCADE;
SHOW CREATE TABLE t2;
Table Create Table
t2 CREATE TABLE `t2` (
`id` int(11) NOT NULL,
`f` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `f` (`f`),
CONSTRAINT `1` FOREIGN KEY (`f`) REFERENCES `t1` (`f`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `t2_t1` FOREIGN KEY (`id`) REFERENCES `t1` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
DROP TABLE t2, t1;
CREATE TABLE t1 (a INT, INDEX(a)) ENGINE=InnoDB;
CREATE TABLE t2 (a INT, INDEX(a)) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (1);
ALTER TABLE t2 ADD FOREIGN KEY (a) REFERENCES t1 (a) ON DELETE SET NULL; set @old_sql_mode = @@sql_mode; set @@sql_mode = 'STRICT_TRANS_TABLES';
ALTER TABLE t2 MODIFY a INT NOT NULL; ERROR HY000: Column 'a' cannot be NOT NULL: needed in a foreign key constraint '1'SET NULL set @@sql_mode = @old_sql_mode;
DELETE FROM t1;
DROP TABLE t2,t1;
CREATE TABLE t1 (a VARCHAR(5) COLLATE utf8_unicode_ci PRIMARY KEY)
ENGINE=InnoDB;
INSERT INTO t1 VALUES (0xEFBCA4EFBCA4EFBCA4);
DELETE FROM t1;
INSERT INTO t1 VALUES ('DDD');
SELECT * FROM t1;
a
DDD
DROP TABLE t1;
CREATE TABLE t1 (id int PRIMARY KEY AUTO_INCREMENT) ENGINE=InnoDB
AUTO_INCREMENT=42;
INSERT INTO t1 VALUES (0),(347),(0);
SELECT * FROM t1;
id 42 347 348
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=349 DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
CREATE TABLE t2 (id int PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t2 VALUES(42),(347),(348);
ALTER TABLE t1 ADD CONSTRAINT t1_t2 FOREIGN KEY (id) REFERENCES t2(id);
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`id`),
CONSTRAINT `t1_t2` FOREIGN KEY (`id`) REFERENCES `t2` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=349 DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
DROP TABLE t1,t2; SET innodb_strict_mode=ON;
CREATE TABLE t1 (
c01 CHAR(255), c02 CHAR(255), c03 CHAR(255), c04 CHAR(255),
c05 CHAR(255), c06 CHAR(255), c07 CHAR(255), c08 CHAR(255),
c09 CHAR(255), c10 CHAR(255), c11 CHAR(255), c12 CHAR(255),
c13 CHAR(255), c14 CHAR(255), c15 CHAR(255), c16 CHAR(255),
c17 CHAR(255), c18 CHAR(255), c19 CHAR(255), c20 CHAR(255),
c21 CHAR(255), c22 CHAR(255), c23 CHAR(255), c24 CHAR(255),
c25 CHAR(255), c26 CHAR(255), c27 CHAR(255), c28 CHAR(255),
c29 CHAR(255), c30 CHAR(255), c31 CHAR(255), c32 CHAR(255)
) ENGINE = InnoDB; ERROR42000: Row size too large (> {checked_valid}). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline. SET innodb_strict_mode=OFF;
DROP TABLE IF EXISTS t1;
Warnings:
Note 1051 Unknown table 'test.t1'
CREATE TABLE t1(
id BIGINT(20) NOT NULL AUTO_INCREMENT PRIMARY KEY
) ENGINE=InnoDB;
INSERT INTO t1 VALUES(-10);
SELECT * FROM t1;
id
-10
INSERT INTO t1 VALUES(NULL);
SELECT * FROM t1;
id
-10 1
DROP TABLE t1;
CONNECT c1,localhost,root,,;
CONNECT c2,localhost,root,,;
connection c1; SET binlog_format='MIXED'; SET TRANSACTION_ISOLATION='read-committed'; SET AUTOCOMMIT=0;
DROP TABLE IF EXISTS t1, t2;
Warnings:
Note 1051 Unknown table 'test.t1,test.t2'
CREATE TABLE t1 ( a int ) ENGINE=InnoDB;
CREATE TABLE t2 LIKE t1;
SELECT * FROM t2;
a
connection c2; SET binlog_format='MIXED'; SET TRANSACTION_ISOLATION='read-committed'; SET AUTOCOMMIT=0;
INSERT INTO t1 VALUES (1);
COMMIT;
connection c1;
SELECT * FROM t1 WHERE a=1;
a 1
disconnect c1;
disconnect c2;
CONNECT c1,localhost,root,,;
CONNECT c2,localhost,root,,;
connection c1; SET binlog_format='MIXED'; SET TRANSACTION_ISOLATION='read-committed'; SET AUTOCOMMIT=0;
SELECT * FROM t2;
a
connection c2; SET binlog_format='MIXED'; SET TRANSACTION_ISOLATION='read-committed'; SET AUTOCOMMIT=0;
INSERT INTO t1 VALUES (2);
COMMIT;
connection c1;
SELECT * FROM t1 WHERE a=2;
a 2
SELECT * FROM t1 WHERE a=2;
a 2
DROP TABLE t1;
DROP TABLE t2;
disconnect c1;
disconnect c2;
connection default;
create table t1 (i int, j int) engine=innodb;
insert into t1 (i, j) values (1, 1), (2, 2);
update t1 set j = 2;
affected rows: 1
info: Rows matched: 2 Changed: 1 Warnings: 0
drop table t1;
create table t1 (id int) comment='this is a comment' engine=innodb;
select table_comment, data_free > 0 as data_free_is_set
from information_schema.tables
where table_schema='test'and table_name = 't1';
table_comment data_free_is_set
this is a comment 1
drop table t1;
connection default;
CREATE TABLE t1 (
c1 INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
c2 VARCHAR(128) NOT NULL,
PRIMARY KEY(c1)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=100;
CREATE TABLE t2 (
c1 INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
c2 INT(10) UNSIGNED DEFAULT NULL,
PRIMARY KEY(c1)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=200;
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't2';
AUTO_INCREMENT 200
ALTER TABLE t2 ADD CONSTRAINT t1_t2_1 FOREIGN KEY(c1) REFERENCES t1(c1);
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't2';
AUTO_INCREMENT 200
DROP TABLE t2;
DROP TABLE t1;
connection default;
CREATE TABLE t1 (c1 int default NULL,
c2 int default NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
TRUNCATE TABLE t1;
affected rows: 0
INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5);
affected rows: 5
info: Records: 5 Duplicates: 0 Warnings: 0
TRUNCATE TABLE t1;
affected rows: 0
DROP TABLE t1;
Variable_name Value
Handler_update 0
Variable_name Value
Handler_delete 0
Variable_name Value
Handler_update 1
Variable_name Value
Handler_delete 1
DROP TABLE bug58912;
create table t1 (f1 integer primary key) engine=innodb;
flush status;
show status like "handler_read_key";
Variable_name Value
Handler_read_key 0
select f1 from t1;
f1
show status like "handler_read_key";
Variable_name Value
Handler_read_key 3
drop table t1;
CREATE TABLE t1 (c1 INT) ENGINE=InnoDB;
CREATE TEMPORARY TABLE t2 (c1 INT) ENGINE=InnoDB;
START TRANSACTION READ ONLY;
INSERT INTO t2 VALUES(0);
INSERT INTO t1 VALUES(0); ERROR25006: Cannot execute statement in a READ ONLY transaction
ROLLBACK;
SELECT * FROM t1;
c1
SELECT * FROM t2;
c1
START TRANSACTION READ ONLY;
INSERT INTO t1 VALUES(0); ERROR25006: Cannot execute statement in a READ ONLY transaction
INSERT INTO t2 VALUES(1);
COMMIT; SET TRANSACTION READ ONLY;
START TRANSACTION;
INSERT INTO t2 VALUES(3);
INSERT INTO t1 VALUES(0); ERROR25006: Cannot execute statement in a READ ONLY transaction
COMMIT;
SELECT * FROM t1;
c1
SELECT * FROM t2;
c1 1 3
DROP TABLE t2;
CREATE TEMPORARY TABLE t2 (
c1 INT AUTO_INCREMENT PRIMARY KEY,
c2 INT, INDEX idx(c2)) ENGINE=InnoDB;
SHOW CREATE TABLE t2;
Table Create Table
t2 CREATE TEMPORARY TABLE `t2` (
`c1` int(11) NOT NULL AUTO_INCREMENT,
`c2` int(11) DEFAULT NULL,
PRIMARY KEY (`c1`),
KEY `idx` (`c2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
START TRANSACTION READ ONLY;
INSERT INTO t2 VALUES(NULL,1),(NULL,2),(NULL,3);
INSERT INTO t1 VALUES(0); ERROR25006: Cannot execute statement in a READ ONLY transaction
ROLLBACK;
SELECT * FROM t1;
c1
SELECT * FROM t2;
c1 c2
START TRANSACTION READ ONLY;
INSERT INTO t1 VALUES(0); ERROR25006: Cannot execute statement in a READ ONLY transaction
INSERT INTO t2 VALUES(NULL,1),(NULL,2),(NULL,3);
COMMIT; SET TRANSACTION READ ONLY;
START TRANSACTION;
INSERT INTO t2 VALUES(NULL,1),(NULL,2),(NULL,3);
INSERT INTO t1 VALUES(0); ERROR25006: Cannot execute statement in a READ ONLY transaction
COMMIT;
SHOW CREATE TABLE t2;
Table Create Table
t2 CREATE TEMPORARY TABLE `t2` (
`c1` int(11) NOT NULL AUTO_INCREMENT,
`c2` int(11) DEFAULT NULL,
PRIMARY KEY (`c1`),
KEY `idx` (`c2`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
SELECT * FROM t1;
c1
SELECT * FROM t2;
c1 c2 41 71 52 82 63 93
DROP TABLE t1;
DROP TABLE t2;
#
# MDEV-24748 Extern field check missing
# in btr_index_rec_validate()
#
CREATE TABLE t1 (pk INT, c1 char(255),
c2 char(255), c3 char(255), c4 char(255),
c5 char(255), c6 char(255), c7 char(255),
c8 char(255), primary key (pk)
) CHARACTER SET utf32 ENGINE=InnoDB;
INSERT INTO t1 VALUES
(1, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'),
(2, 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p');
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
ALTER TABLE t1 FORCE;
DROP TABLE t1;
#
# MDEV-35723: applying zero offset to null pointer on INSERT
#
CREATE TABLE t1(c TEXT(1) NOT NULL, INDEX (c)) ENGINE=InnoDB;
INSERT INTO t1 SET c='';
DROP TABLE t1;
ALTER DATABASE test CHARACTER SET utf8mb4 COLLATE utf8mb4_uca1400_ai_ci;
Messung V0.5 in Prozent
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