IF NOT EXISTS (SELECT * FROM SYS.COLUMNS WHERE NAME = 'QT_EST' AND OBJECT_ID = OBJECT_ID ('EST_PROD_COND_CP_PG_FORN'))
BEGIN
	ALTER TABLE EST_PROD_COND_CP_PG_FORN ADD QT_EST MONEY NOT NULL CONSTRAINT DF_EST_PROD_COND_CP_PG_FORN_QT_EST DEFAULT 0
END
