COALESCE Expression | Teradata Vantage - 17.10 - COALESCE Expression - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1145-171K
Language
English (United States)

Returns NULL if all its arguments evaluate to null. Otherwise, it returns the value of the first non-null argument in the scalar_expression list.

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

   CASE 
    WHEN  scalar_expression_1  IS NOT NULL 
    THEN  scalar_expression_1  
    ...
    WHEN  scalar_expression_n  IS NOT NULL 
    THEN  scalar_expression_n  
    ELSE NULL 
   END

Default Title

The default title for a COALESCE expression appears as:

<CASE expression>