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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