IF NOT EXISTS (SELECT * FROM SYS.COLUMNS WHERE NAME = 'PERC_CMV_PREVISTO' AND OBJECT_ID = OBJECT_ID('EST_ARV_MERC_LINHA'))
begin
ALTER TABLE dbo.EST_ARV_MERC_LINHA ADD
	PERC_CMV_PREVISTO money NOT NULL CONSTRAINT DF_EST_ARV_MERC_LINHA_PERC_CMV_PREVISTO DEFAULT 0
end