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

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>