IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
              WHERE SYSCOLUMNS.NAME = 'TELETIPKAYDIYAPILDI' AND SYSOBJECTS.name = 'HTETKIK')
ALTER TABLE dbo.[HTETKIK] ADD TELETIPKAYDIYAPILDI BIT NULL
GO