CASE Expressions - Teradata Vantage

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 can 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.

Also, 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.

• Valued CASE Expression
• Searched CASE Expression
• CASE Expression Error Conditions
• Rules for the CASE Expression Result Type
• Format for a CASE Expression
• CASE and Nulls