IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
               WHERE SYSCOLUMNS.NAME = 'TRANSFERNEDENLERISEVKNEDENIDTY' AND SYSOBJECTS.name = 'HNAKILBILGILERI')
ALTER TABLE dbo.HNAKILBILGILERI ADD TRANSFERNEDENLERISEVKNEDENIDTY int null

GO