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Version: Stable-3.1

nullif

Description​

Returns NULL if expr1 is equal to expr2. Otherwise, returns expr1.

Syntax​

nullif(expr1,expr2);

Parameters​

expr1 and expr2 must be compatible in data type.

Return value​

The return value has the same type as expr1.

Examples​

mysql> select nullif(1,2);
+--------------+
| nullif(1, 2) |
+--------------+
|            1 |
+--------------+

mysql> select nullif(1,1);
+--------------+
| nullif(1, 1) |
+--------------+
|         NULL |
+--------------+