drop table if exists t1;
CREATE TABLE t1 (c1 INT)
PARTITION BY HASH (c1)
PARTITIONS 15;
INSERT INTO t1 VALUES (1), (2), (3), (4), (5);
ALTER TABLE t1 COALESCE PARTITION 13;
DROP TABLE t1;
CREATE TABLE t1 (c1 INT)
PARTITION BY LINEAR HASH (c1)
PARTITIONS 5;
INSERT INTO t1 VALUES (1), (2), (3), (4), (5);
ALTER TABLE t1 COALESCE PARTITION 3;
DROP TABLE t1;
create table t1 (a int unsigned)
partition by hash(a div 2)
partitions 4;
insert into t1 values (null),(0),(1),(2),(3),(4),(5),(6),(7);
select * from t1 where a < 0;
a
select * from t1 where a is null or (a >= 5and a <= 7);
a
NULL 5 6 7
select * from t1 where a is null;
a
NULL
select * from t1 where a is not null;
a 0 1 2 3 4 5 6 7
select * from t1 where a >= 1and a < 3;
a 1 2
select * from t1 where a >= 3and a <= 5;
a 3 4 5
select * from t1 where a > 2and a < 4;
a 3
select * from t1 where a > 3and a <= 6;
a 4 5 6
select * from t1 where a > 5;
a 6 7
select * from t1 where a >= 1and a <= 5;
a 1 2 3 4 5
explain partitions select * from t1 where a < 0;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p0,p1,p2,p3 ALL NULL NULL NULL NULL 9 Using where
explain partitions select * from t1 where a is null or (a >= 5and a <= 7);
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p0,p2,p3 ALL NULL NULL NULL NULL 7 Using where
explain partitions select * from t1 where a is null;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p0 ALL NULL NULL NULL NULL 3 Using where
explain partitions select * from t1 where a is not null;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p0,p1,p2,p3 ALL NULL NULL NULL NULL 9 Using where
explain partitions select * from t1 where a >= 1and a < 3;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 5 Using where
explain partitions select * from t1 where a >= 3and a <= 5;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p1,p2 ALL NULL NULL NULL NULL 4 Using where
explain partitions select * from t1 where a > 2and a < 4;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p1 ALL NULL NULL NULL NULL 2 Using where
explain partitions select * from t1 where a > 3and a <= 6;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p2,p3 ALL NULL NULL NULL NULL 4 Using where
explain partitions select * from t1 where a > 5;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p0,p1,p2,p3 ALL NULL NULL NULL NULL 9 Using where
explain partitions select * from t1 where a >= 1and a <= 5;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE t1 p0,p1,p2 ALL NULL NULL NULL NULL 7 Using where
drop table t1;
CREATE TABLE t1 (
a int not null,
b int not null,
c int not null,
primary key(a,b))
partition by hash (a + 2)
partitions 3
(partition x1 tablespace ts1,
partition x2 tablespace ts2,
partition x3 tablespace ts3);
insert into t1 values (1,1,1);
insert into t1 values (2,1,1);
insert into t1 values (3,1,1);
insert into t1 values (4,1,1);
insert into t1 values (5,1,1);
select * from t1;
a b c 111 411 211 511 311
update t1 set c=3 where b=1;
select * from t1;
a b c 113 413 213 513 313
select b from t1 where a=3;
b 1
select b,c from t1 where a=1AND b=1;
b c 13
delete from t1 where a=1;
delete from t1 where c=3;
select * from t1;
a b c
ALTER TABLE t1
partition by hash (a + 3)
partitions 3
(partition x1 tablespace ts1,
partition x2 tablespace ts2,
partition x3 tablespace ts3);
select * from t1;
a b c
drop table t1;
CREATE TABLE t1 (
a int not null,
b int not null,
c int not null,
primary key(a,b))
partition by hash (a)
(partition x1);
drop table t1;
CREATE TABLE t1 (
a int not null,
b int not null,
c int not null,
primary key(a,b))
partition by key (a)
(partition x1);
drop table t1;
CREATE TABLE t1 (f1 INTEGER, f2 char(20)) ENGINE = 'MYISAM' PARTITION BY HASH(f1) PARTITIONS 2;
INSERT INTO t1 SET f1 = 0 - 1, f2 = '#######';
select * from t1;
f1 f2
-1 #######
drop table t1; set sql_mode="";
CREATE TABLE t1 (s1 int) ENGINE=BLACKHOLE PARTITION BY HASH (s1);
INSERT INTO t1 VALUES (0);
DROP TABLE t1; set sql_mode=default;
create table t1 (c1 int DEFAULT NULL,
c2 varchar (30) DEFAULT NULL,
c3 date DEFAULT NULL)
engine = myisam
partition by hash (to_days(c3))
partitions 12;
insert into t1 values
(136,'abc','2002-01-05'),(142,'abc','2002-02-14'),(162,'abc','2002-06-28'),
(182,'abc','2002-11-09'),(158,'abc','2002-06-01'),(184,'abc','2002-11-22');
select * from t1;
c1 c2 c3 136 abc 2002-01-05 158 abc 2002-06-01 142 abc 2002-02-14 162 abc 2002-06-28 182 abc 2002-11-09 184 abc 2002-11-22
select * from t1 where c3 between '2002-01-01'and'2002-12-31';
c1 c2 c3 136 abc 2002-01-05 158 abc 2002-06-01 142 abc 2002-02-14 162 abc 2002-06-28 182 abc 2002-11-09 184 abc 2002-11-22
drop table t1;
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM PARTITION BY HASH(c1) PARTITIONS 1;
INSERT DELAYED INTO t1 VALUES (1);
DROP TABLE t1;
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-10-08)
¤
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