!

Syntax

NOT, !

Description

Logical NOT. Evaluates to 1 if the operand is 0, to 0 if the operand is non-zero, and NOT NULL returns NULL.

By default, the ! operator has a higher precedence. If the HIGH_NOT_PRECEDENCE SQL_MODE flag is set, NOT and ! have the same precedence.

Examples

SELECT NOT 10;
+--------+
| NOT 10 |
+--------+
|      0 |
+--------+

SELECT NOT 0;
+-------+
| NOT 0 |
+-------+
|     1 |
+-------+

SELECT NOT NULL;
+----------+
| NOT NULL |
+----------+
|     NULL |
+----------+

SELECT ! (1+1);
+---------+
| ! (1+1) |
+---------+
|       0 |
+---------+

SELECT ! 1+1;
+-------+
| ! 1+1 |
+-------+
|     1 |
+-------+