Compares the values of expr1 and expr2. If the values are the same, null is returned. If the values are not the same, the value of expr1 is returned.
Syntax
T nullif(T <expr1>, T <expr2>)Parameters
expr1 and expr2: required. Expressions of any data type. T specifies the type of input data. The type can be any data type supported by MaxCompute.
Return value
The value of expr1 or null is returned.
Examples
-- The return value is 2.
select nullif(2, 3);
-- The return value is null.
select nullif(2, 2);
-- The return value is 3.
select nullif(3, null);Related functions
For more information, see Other functions.