!
Sintassi
NOT, !
Spiegazione
NOT logico. Restituisce 1 se l'operando è 0, 0 se l'operando è diverso da zero, mentre NOT NULL restituisce NULL.
Esempi
MariaDB [(none)]> SELECT NOT 10; +--------+ | NOT 10 | +--------+ | 0 | +--------+ 1 row in set (0.00 sec) MariaDB [(none)]> SELECT NOT 0; +-------+ | NOT 0 | +-------+ | 1 | +-------+ 1 row in set (0.00 sec) MariaDB [(none)]> SELECT NOT NULL; +----------+ | NOT NULL | +----------+ | NULL | +----------+ 1 row in set (0.00 sec) MariaDB [(none)]> SELECT ! (1+1); +---------+ | ! (1+1) | +---------+ | 0 | +---------+ 1 row in set (0.00 sec) MariaDB [(none)]> SELECT ! 1+1; +-------+ | ! 1+1 | +-------+ | 1 | +-------+ 1 row in set (0.00 sec) MariaDB [(none)]>
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