How to use if / else condition in sql server

Description : in this post display color code name when pass int value in @ColorCode variable if pass 2 in @ColorCode = 2 then it check condition and result will return "GREEN" bacause color code = 2 is green

DECLARE @ColorCode Int

SET @ColorCode = 2

IF (@ColorCode = 1)
BEGIN
 SELECT 'RED' AS ColorName
END
IF (@ColorCode = 2)
BEGIN
 SELECT 'GREEN' AS ColorName
END
IF (@ColorCode = 3)
BEGIN
 SELECT 'BLUE' AS ColorName
END