DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` TRIGGER `vn2008`.`agency_hourBeforeInsert`
	BEFORE INSERT ON `agency_hour`
	FOR EACH ROW
BEGIN
	DECLARE vAlreadyExists BOOLEAN DEFAULT FALSE; 
	IF NEW.week_day IS NULL AND NEW.province_id IS NULL AND NEW.subtract_day = 0 AND NEW.max_hour = 0 THEN
		CALL util.throw ('FILL_MORE_FIELDS');
	END IF;
    
    SELECT COUNT(*) INTO vAlreadyExists
	FROM vn2008.agency_hour
	 WHERE NEW.week_day <=> week_day AND NEW.province_id <=> province_id 
		AND NEW.warehouse_id <=> warehouse_id AND NEW.max_hour <=> max_hour
        AND NEW.agency_id <=> agency_id;
        
	IF vAlreadyExists > 1 THEN
		CALL util.throw('ALREADY_EXISTS');
    END IF;
END$$
DELIMITER ;