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 Teradata Database.
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.