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Conditional Functions

SQL Conditional Functions Overview.

FunctionDescriptionExampleResult
IF(cond1, expr1, [cond2, expr2, ...], expr_else)If cond1 is TRUE, it returns expr1. Otherwise if cond2 is TRUE, it returns expr2, and so on.IF(1 > 2, 3, 4 < 5, 6, 7)6
IFNULL(expr1, expr2)Return expr1 if it is not NULL. Otherwise return expr2. They must have the same data type.IFNULL(0, NULL)0
value [ NOT ] IN (value1, value2, ...)Check whether value is (or is not) one of the members of an explicit list.1 not in (2, 3)1(TRUE)
expr1 IS [ NOT ] DISTINCT FROM expr2Compares whether two expressions are equal (or not equal) with awareness of nullability, meaning it treats NULLs as known values for comparing equality.NULL is distinct from NULL0(FALSE)
IS_NOT_NULL(expr)Check whether the value is not NULL.IS_NOT_NULL(1)1(TRUE)
IS_NULL(expr)Check whether the value is NULL.IS_NULL(1)0(FALSE)
NULLIF(expr1, expr2)Return NULL if two expressions are equal. Otherwise return expr1. They must have the same data type.NULLIF(0, NULL)0