The Ultimate Guide to High Availability with MariaDB

COALESCE

Sintassi

COALESCE(valore, ...)

Spiegazione

Restituisce il primo valore non-NULL della lista, o NULL se non vi sono argomenti non-NULL. Almeno un argomento deve essere passato.

Esempi

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

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

MariaDB [(none)]>

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