17.10 - CASE Expressions - Advanced SQL Engine - Teradata Database

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

Advanced SQL Engine
Teradata Database
Release Number
Release Date
July 2021
Content Type
Programming Reference
Publication ID
English (United States)

Specifies alternate values for a conditional expression or expressions based on equality comparisons and conditions that evaluate to TRUE.

CASE provides an efficient and powerful method for application developers to change the representation of data, permitting conversion without requiring host program intervention.

For example, you could code employee status as 1 or 2, meaning full-time or part-time, respectively. For efficiency, the system stores the numeric code but prints or displays the appropriate textual description in reports. This storage and conversion is managed by Vantage.

In addition, CASE permits applications to generate nulls based on information derived from the database, again without host program intervention. Conversely, CASE can be used to convert a null into a value.