NULLIF Expression

Teradata Vantageā„¢ SQL Functions, Expressions, and Predicates

brand
Software
Teradata Vantage
prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1145-162K

Purpose

Returns NULL if its arguments are equal. Otherwise, it returns its first argument, scalar_expression_1.

NULLIF is a shorthand expression for the following full CASE expression:

   CASE 
    WHEN  scalar_expression_1=scalar_expression_2  
    THEN NULL
    ELSE  scalar_expression_1  
   END

Syntax