Logical NOT.
Return 1 if the operand is 0.
Return 0 if the operand is non-zero.
mysql>mysql> SELECT NOT 10;+--------+| NOT 10 |+--------+| 0 |+--------+1 row in set (0.00 sec)mysql> SELECT NOT 0;+-------+| NOT 0 |+-------+| 1 |+-------+1 row in set (0.00 sec)
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