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SELECT DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, 0) As First_Of_Current_Month , DateAdd(dd, -1, DateAdd(mm, DateDiff(mm, 0, GETDATE()) +1, 0)) As Last_Of_Current_Month , DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, 0) As First_Of_Last_Month , DATEADD(MONTH, DATEDIFF(MONTH, -1, GETDATE()) -1, -1) As Last_Of_Last_Month;