IS NOT

Sintassi

IS NOT 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 NOT UNKNOWN, 0 IS NOT UNKNOWN, NULL IS NOT UNKNOWN;
+------------------+------------------+---------------------+
| 1 IS NOT UNKNOWN | 0 IS NOT UNKNOWN | NULL IS NOT UNKNOWN |
+------------------+------------------+---------------------+
|                1 |                1 |                   0 |
+------------------+------------------+---------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> 

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