CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server.
SELECT CAST( CASE WHEN Obsolete="N" or InStock = 'Y' THEN 1 ELSE 0 END AS bit) as Saleable, * FROM Product
You only need to use the
CAST operator if you want the result as a Boolean value. If you are happy with an
int, this works:
SELECT CASE WHEN Obsolete="N" or InStock = 'Y' THEN 1 ELSE 0 END as Saleable, * FROM Product
CASE statements can be embedded in other
CASE statements and even included in aggregates.
SQL Server Denali (SQL Server 2012) adds the IIF statement which is also available in access (pointed out by Martin Smith):
SELECT IIF(Obsolete="N" or InStock = 'Y', 1, 0) as Saleable, * FROM Product