IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
              WHERE SYSCOLUMNS.NAME = 'DHSB12' AND SYSOBJECTS.name = 'HYGUVENLIDOGUMSURECI')
ALTER TABLE dbo.HYGUVENLIDOGUMSURECI ADD UYGMDLACIKLAMAIZLEMDENGETIR bit not null CONSTRAINT DF_HYGUVENLIDOGUMSURECI_HYGUVENLIDOGUMSURECI DEFAULT 0
go