Boolean operator: NOT : Operator « Procedure Function « MySQL Tutorial

1. MySQL Tutorial
2. Procedure Function
3. Operator

mysql> delimiter $$
mysql>
mysql>
mysql> CREATE PROCEDURE myProc()
    -> BEGIN
    ->         DECLARE a INT DEFAULT 2;
    ->         DECLARE b INT DEFAULT 3;
    ->         DECLARE c FLOAT;
    ->
    ->         IF NOT (a=b) THEN
    ->                 SELECT 'a is not equal to b';
    ->         END IF;
    -> END$$
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> delimiter ;
mysql> call myProc();
+---------------------+
| a is not equal to b |
+---------------------+
| a is not equal to b |
+---------------------+
1 row in set (0.02 sec)

Query OK, 0 rows affected (0.02 sec)

mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)

mysql>