DECLARE @test TABLE
(
id INT IDENTITY PRIMARY KEY,
Tarih DATETIME DEFAULT GETDATE() NULL,
Yil AS DATEPART(YEAR, Tarih),
Ay AS DATEPART(MONTH, Tarih)
);
INSERT INTO @test ( Tarih ) VALUES ( '2014/1/1' );
INSERT INTO @test ( Tarih ) VALUES ( '2014/1/31' );
INSERT INTO @test ( Tarih ) VALUES ( '2014/2/1' );
INSERT INTO @test ( Tarih ) VALUES ( '2014/3/1' );
SELECT * FROM @test AS t;