SQL Server IIF() Function

Return "YES" if the condition is TRUE, or "NO" if the condition is FALSE:

SELECT IIF(500<1000, 'YES', 'NO');

Definition and Usage

The IIF() function returns a value if a condition is TRUE, or another value if a condition is FALSE.

IIF(condition, value_if_true, value_if_false)

Parameter	Description
condition	Required. The value to test
value_if_true	Optional. The value to return if condition is TRUE
value_if_false	Optional. The value to return if condition is FALSE

Works in:	SQL Server (starting with 2012), Azure SQL Database

Return 5 if the condition is TRUE, or 10 if the condition is FALSE:

SELECT IIF(500<1000, 5, 10);

Test whether two strings are the same and return "YES" if they are, or "NO" if not:

SELECT IIF('hello' = 'bye', 'YES', 'NO');

Return "MORE" if the condition is TRUE, or "LESS" if the condition is FALSE:

SELECT OrderID, Quantity, IIF(Quantity>10, 'MORE', 'LESS')
FROM OrderDetails;