NULLIF
Syntax
NULLIF(expr1,expr2)
Contents
Description
Returns NULL if expr1 = expr2 is true, otherwise returns expr1. This is the same as CASE WHEN expr1 = expr2 THEN NULL ELSE expr1 END.
Examples
SELECT NULLIF(1,1); +-------------+ | NULLIF(1,1) | +-------------+ | NULL | +-------------+ SELECT NULLIF(1,2); +-------------+ | NULLIF(1,2) | +-------------+ | 1 | +-------------+
See Also
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