salix/db/routines/vn/triggers/expedition_beforeDelete.sql

DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` TRIGGER `vn`.`expedition_beforeDelete`
	BEFORE DELETE ON `expedition`
	FOR EACH ROW
BEGIN
    UPDATE ticket t 
        SET packages = (SELECT COUNT(counter)-1 
		FROM expedition e WHERE e.ticketFk = OLD.ticketFk and e.freightItemFk)
		WHERE t.id = OLD.ticketFk;	
        
END$$
DELIMITER ;