IF EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
              WHERE SYSCOLUMNS.NAME = 'PatientHistorySearchStatus' AND SYSOBJECTS.name = 'HTETKIKTELETIP')
ALTER TABLE HTETKIKTELETIP ALTER COLUMN PatientHistorySearchStatus [nvarchar](200) NULL