The Ultimate Guide to High Availability with MariaDB

&&

Sintassi

AND, &&

Spiegazione

AND logico. Restituisce 1 se tutti gli operandi sono diversi da zero e da NULL, 0 se uno o più operandi sono zero, altrimenti restituisce NULL.

Esempi

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

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

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

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

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

MariaDB [(none)]>

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