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DROP PROCEDURE IF EXISTS AddOrderItem;
DELIMITER $$
CREATE PROCEDURE AddOrderItem(
in orderNo int,
in productCode varchar(45),
in qty int,
in price double,
in lineNo int )
BEGIN
DECLARE C INT;
SELECT COUNT(orderNumber) INTO C
FROM orders
WHERE orderNumber = orderNo;
#SELECT C;
-- check if orderNumber exists
IF(C != 1) THEN
SIGNAL SQLSTATE '45000'
SET MESSAGE_TEXT = 'Order No not found in orders table';
END IF;
-- more code below
-- ...
END$$
DELIMITER ;