DROP TABLE IF EXISTS t6;
CREATE TABLE t6(c1 TINYINT UNSIGNED NULL);
PREPARE stmt6 FROM 'INSERT INTO t6 (c1) VALUES(?)'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1 0 255
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 2
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 2
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'SELECT * FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a;
c1 SET @a=0;
EXECUTE stmt6 USING @a;
c1 0 SET @a=255;
EXECUTE stmt6 USING @a;
c1 255
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'UPDATE t6 SET c1 = ? WHERE c1 = ?'; SET @a=NULL; SET @b=0;
EXECUTE stmt6 USING @a,@b; SET @a=0; SET @b=NULL;
EXECUTE stmt6 USING @a,@b; SET @a=255; SET @a=201;
EXECUTE stmt6 USING @a,@b;
SELECT * FROM t6;
c1 255
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 1
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 1
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'DELETE FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 0
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 0
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 0
DEALLOCATE PREPARE stmt6;
DROP TABLE t6;
CREATE TABLE t6(c1 SMALLINT UNSIGNED NULL);
PREPARE stmt6 FROM 'INSERT INTO t6 (c1) VALUES(?)'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1 0 255
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 2
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 2
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'SELECT * FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a;
c1 SET @a=0;
EXECUTE stmt6 USING @a;
c1 0 SET @a=255;
EXECUTE stmt6 USING @a;
c1 255
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'UPDATE t6 SET c1 = ? WHERE c1 = ?'; SET @a=NULL; SET @b=0;
EXECUTE stmt6 USING @a,@b; SET @a=0; SET @b=NULL;
EXECUTE stmt6 USING @a,@b; SET @a=255; SET @a=201;
EXECUTE stmt6 USING @a,@b;
SELECT * FROM t6;
c1 255
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 1
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 1
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'DELETE FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 0
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 0
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 0
DEALLOCATE PREPARE stmt6;
DROP TABLE t6;
CREATE TABLE t6(c1 MEDIUMINT UNSIGNED NULL);
PREPARE stmt6 FROM 'INSERT INTO t6 (c1) VALUES(?)'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1 0 255
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 2
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 2
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'SELECT * FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a;
c1 SET @a=0;
EXECUTE stmt6 USING @a;
c1 0 SET @a=255;
EXECUTE stmt6 USING @a;
c1 255
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'UPDATE t6 SET c1 = ? WHERE c1 = ?'; SET @a=NULL; SET @b=0;
EXECUTE stmt6 USING @a,@b; SET @a=0; SET @b=NULL;
EXECUTE stmt6 USING @a,@b; SET @a=255; SET @a=201;
EXECUTE stmt6 USING @a,@b;
SELECT * FROM t6;
c1 255
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 1
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 1
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'DELETE FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 0
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 0
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 0
DEALLOCATE PREPARE stmt6;
DROP TABLE t6;
CREATE TABLE t6(c1 INT UNSIGNED NULL);
PREPARE stmt6 FROM 'INSERT INTO t6 (c1) VALUES(?)'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1 0 255
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 2
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 2
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'SELECT * FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a;
c1 SET @a=0;
EXECUTE stmt6 USING @a;
c1 0 SET @a=255;
EXECUTE stmt6 USING @a;
c1 255
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'UPDATE t6 SET c1 = ? WHERE c1 = ?'; SET @a=NULL; SET @b=0;
EXECUTE stmt6 USING @a,@b; SET @a=0; SET @b=NULL;
EXECUTE stmt6 USING @a,@b; SET @a=255; SET @a=201;
EXECUTE stmt6 USING @a,@b;
SELECT * FROM t6;
c1 255
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 1
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 1
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'DELETE FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 0
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 0
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 0
DEALLOCATE PREPARE stmt6;
DROP TABLE t6;
CREATE TABLE t6(c1 INTEGER UNSIGNED NULL);
PREPARE stmt6 FROM 'INSERT INTO t6 (c1) VALUES(?)'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1 0 255
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 2
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 2
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'SELECT * FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a;
c1 SET @a=0;
EXECUTE stmt6 USING @a;
c1 0 SET @a=255;
EXECUTE stmt6 USING @a;
c1 255
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'UPDATE t6 SET c1 = ? WHERE c1 = ?'; SET @a=NULL; SET @b=0;
EXECUTE stmt6 USING @a,@b; SET @a=0; SET @b=NULL;
EXECUTE stmt6 USING @a,@b; SET @a=255; SET @a=201;
EXECUTE stmt6 USING @a,@b;
SELECT * FROM t6;
c1 255
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 1
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 1
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'DELETE FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 0
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 0
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 0
DEALLOCATE PREPARE stmt6;
DROP TABLE t6;
CREATE TABLE t6(c1 BIGINT UNSIGNED NULL);
PREPARE stmt6 FROM 'INSERT INTO t6 (c1) VALUES(?)'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1 0 255
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 2
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 2
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'SELECT * FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a;
c1 SET @a=0;
EXECUTE stmt6 USING @a;
c1 0 SET @a=255;
EXECUTE stmt6 USING @a;
c1 255
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'UPDATE t6 SET c1 = ? WHERE c1 = ?'; SET @a=NULL; SET @b=0;
EXECUTE stmt6 USING @a,@b; SET @a=0; SET @b=NULL;
EXECUTE stmt6 USING @a,@b; SET @a=255; SET @a=201;
EXECUTE stmt6 USING @a,@b;
SELECT * FROM t6;
c1 255
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 1
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 1
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 1
DEALLOCATE PREPARE stmt6;
PREPARE stmt6 FROM 'DELETE FROM t6 WHERE c1 = ?'; SET @a=NULL;
EXECUTE stmt6 USING @a; SET @a=0;
EXECUTE stmt6 USING @a; SET @a=255;
EXECUTE stmt6 USING @a;
SELECT * FROM t6;
c1
NULL
NULL
SELECT COUNT(c1) AS total_rows FROM t6;
total_rows 0
SELECT COUNT(c1) AS positive_rows FROM t6 WHERE c1 > 0;
positive_rows 0
SELECT COUNT(c1) AS null_rows FROM t6 WHERE c1 IS NULL;
null_rows 0
SELECT COUNT(c1) AS not_null_rows FROM t6 WHERE c1 IS NOT NULL;
not_null_rows 0
DEALLOCATE PREPARE stmt6;
DROP TABLE t6;
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.14 Sekunden
(vorverarbeitet am 2026-10-08)
¤
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