The Ultimate Guide to High Availability with MariaDB

IS NOT

Stai visualizzando una vecchia versione di questo article. Visualizza la versione più recente.

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)]>

Commenti

Sto caricando i commenti......
Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.