DROP TABLE IF EXISTS t1;
CREATE TABLE t1(c1 CHAR(100) NULL);
PREPARE stmt1 FROM 'INSERT INTO t1 (c1) VALUES(?)';
SET @a=NULL;
EXECUTE stmt1 USING @a;
SET @a='';
EXECUTE stmt1 USING @a;
SET @a='x';
EXECUTE stmt1 USING @a;
SET @a='123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'SELECT * FROM t1 WHERE c1 = ?';
SET @a=NULL;
EXECUTE stmt1 USING @a;
c1
SET @a='';
EXECUTE stmt1 USING @a;
c1

SET @a='x';
EXECUTE stmt1 USING @a;
c1
x
DEALLOCATE PREPARE stmt1;
PREPARE stmt1 FROM 'UPDATE t1 SET c1 = ? WHERE c1 = ?';
SET @a=NULL;
SET @b='a';
EXECUTE stmt1 USING @a,@b;
SET @a='';
SET @b='b';
EXECUTE stmt1 USING @a,@b;
SET @a='x';
SET @b='c';
EXECUTE stmt1 USING @a,@c;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'DELETE FROM t1 WHERE c1 = ?';
SET @a='a';
EXECUTE stmt1 USING @a;
SET @a='b';
EXECUTE stmt1 USING @a;
SET @a='c';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
DROP TABLE t1;
CREATE TABLE t1(c1 VARCHAR(100) NULL);
PREPARE stmt1 FROM 'INSERT INTO t1 (c1) VALUES(?)';
SET @a=NULL;
EXECUTE stmt1 USING @a;
SET @a='';
EXECUTE stmt1 USING @a;
SET @a='x';
EXECUTE stmt1 USING @a;
SET @a='123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'SELECT * FROM t1 WHERE c1 = ?';
SET @a=NULL;
EXECUTE stmt1 USING @a;
c1
SET @a='';
EXECUTE stmt1 USING @a;
c1

SET @a='x';
EXECUTE stmt1 USING @a;
c1
x
DEALLOCATE PREPARE stmt1;
PREPARE stmt1 FROM 'UPDATE t1 SET c1 = ? WHERE c1 = ?';
SET @a=NULL;
SET @b='a';
EXECUTE stmt1 USING @a,@b;
SET @a='';
SET @b='b';
EXECUTE stmt1 USING @a,@b;
SET @a='x';
SET @b='c';
EXECUTE stmt1 USING @a,@c;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'DELETE FROM t1 WHERE c1 = ?';
SET @a='a';
EXECUTE stmt1 USING @a;
SET @a='b';
EXECUTE stmt1 USING @a;
SET @a='c';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
DROP TABLE t1;
CREATE TABLE t1(c1 BINARY(100) NULL);
PREPARE stmt1 FROM 'INSERT INTO t1 (c1) VALUES(?)';
SET @a=NULL;
EXECUTE stmt1 USING @a;
SET @a='';
EXECUTE stmt1 USING @a;
SET @a='x';
EXECUTE stmt1 USING @a;
SET @a='123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL
                                                                                                    
x                                                                                                   
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'SELECT * FROM t1 WHERE c1 = ?';
SET @a=NULL;
EXECUTE stmt1 USING @a;
c1
SET @a='';
EXECUTE stmt1 USING @a;
c1
SET @a='x';
EXECUTE stmt1 USING @a;
c1
DEALLOCATE PREPARE stmt1;
PREPARE stmt1 FROM 'UPDATE t1 SET c1 = ? WHERE c1 = ?';
SET @a=NULL;
SET @b='a';
EXECUTE stmt1 USING @a,@b;
SET @a='';
SET @b='b';
EXECUTE stmt1 USING @a,@b;
SET @a='x';
SET @b='c';
EXECUTE stmt1 USING @a,@c;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL
                                                                                                    
x                                                                                                   
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'DELETE FROM t1 WHERE c1 = ?';
SET @a='a';
EXECUTE stmt1 USING @a;
SET @a='b';
EXECUTE stmt1 USING @a;
SET @a='c';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL
                                                                                                    
x                                                                                                   
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
DROP TABLE t1;
CREATE TABLE t1(c1 VARBINARY(100) NULL);
PREPARE stmt1 FROM 'INSERT INTO t1 (c1) VALUES(?)';
SET @a=NULL;
EXECUTE stmt1 USING @a;
SET @a='';
EXECUTE stmt1 USING @a;
SET @a='x';
EXECUTE stmt1 USING @a;
SET @a='123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'SELECT * FROM t1 WHERE c1 = ?';
SET @a=NULL;
EXECUTE stmt1 USING @a;
c1
SET @a='';
EXECUTE stmt1 USING @a;
c1

SET @a='x';
EXECUTE stmt1 USING @a;
c1
x
DEALLOCATE PREPARE stmt1;
PREPARE stmt1 FROM 'UPDATE t1 SET c1 = ? WHERE c1 = ?';
SET @a=NULL;
SET @b='a';
EXECUTE stmt1 USING @a,@b;
SET @a='';
SET @b='b';
EXECUTE stmt1 USING @a,@b;
SET @a='x';
SET @b='c';
EXECUTE stmt1 USING @a,@c;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'DELETE FROM t1 WHERE c1 = ?';
SET @a='a';
EXECUTE stmt1 USING @a;
SET @a='b';
EXECUTE stmt1 USING @a;
SET @a='c';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
DROP TABLE t1;
CREATE TABLE t1(c1 BLOB(100) NULL);
PREPARE stmt1 FROM 'INSERT INTO t1 (c1) VALUES(?)';
SET @a=NULL;
EXECUTE stmt1 USING @a;
SET @a='';
EXECUTE stmt1 USING @a;
SET @a='x';
EXECUTE stmt1 USING @a;
SET @a='123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'SELECT * FROM t1 WHERE c1 = ?';
SET @a=NULL;
EXECUTE stmt1 USING @a;
c1
SET @a='';
EXECUTE stmt1 USING @a;
c1

SET @a='x';
EXECUTE stmt1 USING @a;
c1
x
DEALLOCATE PREPARE stmt1;
PREPARE stmt1 FROM 'UPDATE t1 SET c1 = ? WHERE c1 = ?';
SET @a=NULL;
SET @b='a';
EXECUTE stmt1 USING @a,@b;
SET @a='';
SET @b='b';
EXECUTE stmt1 USING @a,@b;
SET @a='x';
SET @b='c';
EXECUTE stmt1 USING @a,@c;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'DELETE FROM t1 WHERE c1 = ?';
SET @a='a';
EXECUTE stmt1 USING @a;
SET @a='b';
EXECUTE stmt1 USING @a;
SET @a='c';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
DROP TABLE t1;
CREATE TABLE t1(c1 TEXT(100) NULL);
PREPARE stmt1 FROM 'INSERT INTO t1 (c1) VALUES(?)';
SET @a=NULL;
EXECUTE stmt1 USING @a;
SET @a='';
EXECUTE stmt1 USING @a;
SET @a='x';
EXECUTE stmt1 USING @a;
SET @a='123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'SELECT * FROM t1 WHERE c1 = ?';
SET @a=NULL;
EXECUTE stmt1 USING @a;
c1
SET @a='';
EXECUTE stmt1 USING @a;
c1

SET @a='x';
EXECUTE stmt1 USING @a;
c1
x
DEALLOCATE PREPARE stmt1;
PREPARE stmt1 FROM 'UPDATE t1 SET c1 = ? WHERE c1 = ?';
SET @a=NULL;
SET @b='a';
EXECUTE stmt1 USING @a,@b;
SET @a='';
SET @b='b';
EXECUTE stmt1 USING @a,@b;
SET @a='x';
SET @b='c';
EXECUTE stmt1 USING @a,@c;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
PREPARE stmt1 FROM 'DELETE FROM t1 WHERE c1 = ?';
SET @a='a';
EXECUTE stmt1 USING @a;
SET @a='b';
EXECUTE stmt1 USING @a;
SET @a='c';
EXECUTE stmt1 USING @a;
DEALLOCATE PREPARE stmt1;
SELECT * FROM t1;
c1
NULL

x
123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.123456789.
SELECT COUNT(c1) AS total_rows FROM t1;
total_rows
3
SELECT COUNT(c1) AS null_rows FROM t1 WHERE c1 IS NULL;
null_rows
0
SELECT COUNT(c1) AS not_null_rows FROM t1 WHERE c1 IS NOT NULL;
not_null_rows
3
DROP TABLE t1;