IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
               WHERE SYSCOLUMNS.NAME = 'KVKKONAY' AND SYSOBJECTS.name = 'HKIMLIKGIZLILIK')
ALTER TABLE dbo.HKIMLIKGIZLILIK ADD
	KVKKONAY BIT NULL
GO