DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` TRIGGER `vn`.`postCode_beforeInsert`
	BEFORE INSERT ON `postCode`
	FOR EACH ROW
BEGIN
    SET NEW.geoFk = zoneGeo_new('postCode', NEW.`code`,
		(SELECT geoFk FROM town WHERE id = NEW.townFk));
END$$
DELIMITER ;