Logical OR (OR( || )) : OR « Logic Operator « MySQL Tutorial

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MySQL Tutorial » Logic Operator » OR 
8. 4. 1. Logical OR (OR( || ))

When both operands are non-NULL, the result is 1 if any operand is non-zero, and 0 otherwise.

With a NULL operand, the result is 1 if the other operand is non-zero, and NULL otherwise.

If both operands are NULL, the result is NULL.

mysql>
mysql> SELECT || 1;
+--------+
|| |
+--------+
|      |
+--------+
row in set (0.00 sec)

mysql> SELECT || 0;
+--------+
|| |
+--------+
|      |
+--------+
row in set (0.00 sec)

mysql> SELECT || 0;
+--------+
|| |
+--------+
|      |
+--------+
row in set (0.00 sec)
8. 4. OR
8. 4. 1. Logical OR (OR( || ))
8. 4. 2. Using Logical OR operator with NULL value
8. 4. 3. Using OR to link two conditions
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