We can achieve same with date part.
SELECT [Month] = DATENAME(mm,Created_Date), Sale
FROM
(
SELECT Created_Date = '2012-12-01', Sale = 10000
UNION
SELECT Created_Date = '2012-02-01', Sale = 1000
UNION
SELECT Created_Date = '2012-03-01', Sale = 2500
UNION
SELECT Created_Date...