&&
Sintassi
AND, &&
Spiegazione
AND logico. Restituisce 1 se tutti gli operandi sono diversi da zero e da NULL, 0 se uno o più operandi sono zero, altrimenti restituisce NULL.
Esempi
MariaDB [(none)]> SELECT 1 && 1; +--------+ | 1 && 1 | +--------+ | 1 | +--------+ 1 row in set (0.00 sec) MariaDB [(none)]> SELECT 1 && 0; +--------+ | 1 && 0 | +--------+ | 0 | +--------+ 1 row in set (0.00 sec) MariaDB [(none)]> SELECT 1 && NULL; +-----------+ | 1 && NULL | +-----------+ | NULL | +-----------+ 1 row in set (0.00 sec) MariaDB [(none)]> SELECT 0 && NULL; +-----------+ | 0 && NULL | +-----------+ | 0 | +-----------+ 1 row in set (0.00 sec) MariaDB [(none)]> SELECT NULL && 0; +-----------+ | NULL && 0 | +-----------+ | 0 | +-----------+ 1 row in set (0.00 sec) MariaDB [(none)]>
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