DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` FUNCTION `vn`.`getTicketTrolleyLabelCount`(vTicket INT)
	RETURNS int(11)
	NOT DETERMINISTIC
	READS SQL DATA
BEGIN
	DECLARE vLabelCount INT DEFAULT 0;

	SELECT labelCount INTO vLabelCount 
		FROM ticketTrolley
		WHERE ticket = vTicket;

	SET vLabelCount = vLabelCount +1 ;

	REPLACE ticketTrolley(ticket,labelCount)
		SELECT vTicket, vLabelCount;

	RETURN vlabelCount;
END$$
DELIMITER ;