IIF()

Tip

Find a more recent version at Firebird 5.0 Language Reference: IIF()

Available in: DSQL, PSQL

Added in: 2.0

Description: IIF takes three arguments. If the first evaluates to true, the second argument is returned; otherwise the third is returned.

Result type: Depends on input.

Syntax:

IIF (<condition>, ResultT, ResultF)

<condition>  ::=  A boolean expression.

Example:

select iif( sex = 'M', 'Sir', 'Madam' ) from Customers

IIF(Cond, Result1, Result2) is a shortcut for “CASE WHEN Cond THEN Result1 ELSE Result2 END”. You can also compare IIF to the ternary “? :” operator in C-like languages.