!
Syntax
NOT, !
Contents
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 | +-------+
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