IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
              WHERE SYSCOLUMNS.NAME = 'LOINCKLASIFIKASYON' AND SYSOBJECTS.name = 'TSUTLOINC')
ALTER TABLE TSUTLOINC ADD LOINCKLASIFIKASYON [nvarchar](100) NULL