IS
Sintassi
IS valore_booleano
Spiegazione
Confronta un valore con un valore booleano, dove valore_booleano può essere TRUE, FALSE o UNKNOWN.
Esempi
MariaDB [(none)]> SELECT 1 IS TRUE, 0 IS FALSE, NULL IS UNKNOWN; +-----------+------------+-----------------+ | 1 IS TRUE | 0 IS FALSE | NULL IS UNKNOWN | +-----------+------------+-----------------+ | 1 | 1 | 1 | +-----------+------------+-----------------+ 1 row in set (0.00 sec) MariaDB [(none)]>
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