IF NOT EXISTS (SELECT * FROM SYS.COLUMNS WHERE NAME = 'NAO_USA_LISTA' AND OBJECT_ID = OBJECT_ID('EST_PROD_DESC_MARGEM_LISTA'))
ALTER TABLE dbo.EST_PROD_DESC_MARGEM_LISTA ADD
	NAO_USA_LISTA int NOT NULL CONSTRAINT DF_EST_PROD_DESC_MARGEM_LISTA_NAO_USA_LISTA DEFAULT 0