16.20 - NULLIF Expression - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1145-162K
Language
English (United States)

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