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DROP PROCEDURE IF EXISTS GetDeliveryStatus;
DELIMITER $$
CREATE PROCEDURE GetDeliveryStatus(
IN pOrderNumber INT,
OUT pDeliveryStatus VARCHAR(15)
)
BEGIN
DECLARE waitingDay INT DEFAULT 0;
SELECT
DATEDIFF(requiredDate, shippedDate)
INTO waitingDay
FROM orders
WHERE orderNumber = pOrderNumber;
#select waitingDay;
CASE
WHEN waitingDay = 0 THEN
SET pDeliveryStatus = 'On Time';
WHEN waitingDay >= 1 AND waitingDay <= 4 THEN
SET pDeliveryStatus = 'Late';
WHEN waitingDay >= 5 THEN
SET pDeliveryStatus = 'Very Late';
ELSE
#SET pDeliveryStatus = 'No Information';
SELECT `status` INTO pDeliveryStatus FROM orders WHERE orderNumber = pOrderNumber;
END CASE;
END$$
DELIMITER ;