IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
              WHERE SYSCOLUMNS.NAME = 'ODEMESIZYAPILABILSIN' AND SYSOBJECTS.name = 'TITEM')
ALTER TABLE dbo.[TITEM] ADD ODEMESIZYAPILABILSIN bit not null CONSTRAINT DF_TITEM_ODEMESIZYAPILABILSIN DEFAULT 0
go