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