IF EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
              WHERE SYSCOLUMNS.NAME = 'SAKLAMABIRIMMIKTAR' AND SYSOBJECTS.name = 'TITEM')
ALTER TABLE dbo.TITEM ALTER COLUMN
	SAKLAMABIRIMMIKTAR numeric(9, 2) NULL 
GO