IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
              WHERE SYSCOLUMNS.NAME = 'NETSIM_AKTARILDI' AND SYSOBJECTS.name = 'FATISL')
ALTER TABLE dbo.[FATISL] ADD 	NETSIM_AKTARILDI  bit NOT NULL CONSTRAINT [DF_FATISL_NETSIM_AKTARILDI] DEFAULT (0)
GO