Answer Posted / sonu

The SELECT statement begins a SELECT group. SELECT groups contain WHEN statements that identify SAS statements that are executed when a particular condition is true. Use at least one WHEN statement in a SELECT group. An optional OTHERWISE statement specifies a statement to be executed if no WHEN condition is met. An END statement ends a SELECT group.
Null statements that are used in WHEN statements cause SAS to recognize a condition as true without taking further action. Null statements that are used in OTHERWISE statements prevent SAS from issuing an error message when all WHEN conditions are false.
Using Select-When improves processing efficiency and understandability in programs that needed to check a series of conditions for the same variable.
Use IF-THEN/ELSE statements for programs with few statements.
Using a subsetting IF statement without a THEN clause could be dangerous because it would process only those records that meet the condition specified in the IF clause.

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