DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` TRIGGER `vn`.`priceFixed_beforeUpdate`
	BEFORE UPDATE ON `priceFixed`
	FOR EACH ROW
BEGIN
	DECLARE vDated DATE;
	IF NEW.started > NEW.ended THEN
		SET vDated = NEW.started;
		SET NEW.started = NEW.ended;
		SET NEW.ended = vDated;
	END IF;
END$$
DELIMITER ;