The Ultimate Guide to High Availability with MariaDB
This is a read-only copy of the MariaDB Knowledgebase generated on 2024-05-19. For the latest, interactive version please visit https://mariadb.com/kb/.

IFNULL

Sintassi

IFNULL(espr1,espr2)

Descrizione

Se espr1 non è NULL, IFNULL() restituisce espr1; altrimenti restituisce espr2. IFNULL() restituisce un valore numerico o stringa, a seconda del contesto in cui è usato.

Esempi

MariaDB [(none)]> SELECT IFNULL(1,0); 
+-------------+
| IFNULL(1,0) |
+-------------+
|           1 |
+-------------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT IFNULL(NULL,10);
+-----------------+
| IFNULL(NULL,10) |
+-----------------+
|              10 |
+-----------------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT IFNULL(1/0,10);
+----------------+
| IFNULL(1/0,10) |
+----------------+
|        10.0000 |
+----------------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT IFNULL(1/0,'sì');
+-------------------+
| IFNULL(1/0,'yes') |
+-------------------+
| sì                |
+-------------------+
1 row in set (0.00 sec)

MariaDB [(none)]>
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