IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
               WHERE SYSCOLUMNS.NAME = 'REFTCKIMLIKNO' AND SYSOBJECTS.name = 'HKURUMPERSONEL')
ALTER TABLE dbo.HKURUMPERSONEL ADD
	REFTCKIMLIKNO nvarchar(11) NULL
GO