IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
              WHERE SYSCOLUMNS.NAME = 'MESLEKIMARUZIYETDURUMID' AND SYSOBJECTS.name = 'HMUAYENE')
ALTER TABLE HMUAYENE ADD [MESLEKIMARUZIYETDURUMID] bit