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Version: 2.5

nullif

Description​

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

Syntax​

nullif(expr1,expr2);

Parameters​

expr1: This expression must evaluate to any of the following data types: BOOLEAN, TINYINT, SMALLINT, INT, BIGINT, LARGEINT, FLOAT, DOUBLE, DATETIME, DATE, DECIMALV2, DECIMAL32, DECIMAL64, DECIMAL128, VARCHAR, BITMAP, PERCENTILE, HLL, TIME.

expr2: An expression that evaluates to the same data type as expr1.

expr1 and expr2 must agree in data type.

Return value​

The return value has the same type as expr1.

Examples​

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

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