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USE classicmodels;
DROP PROCEDURE IF EXISTS classicmodels.BalanceDue;
DELIMITER //
CREATE PROCEDURE BalanceDue(
IN p_customerNumber INT(11),
OUT p_HasBalanceDue VARCHAR(3),
OUT p_AmountDue DOUBLE)
BEGIN
DECLARE OrderAmount double;
DECLARE AmountPayed double;
SET OrderAmount = (
SELECT SUM(quantityOrdered * priceEach)
FROM orders
INNER JOIN orderdetails ON orders.orderNumber = orderdetails.orderNumber
INNER JOIN customers ON customers.customerNumber = orders.customerNumber
WHERE customers.customerNumber = p_customerNumber);
SET AmountPayed = (
SELECT SUM(amount)
FROM payments
INNER JOIN customers ON customers.customerNumber = payments.customerNumber
WHERE customers.customerNumber = p_customerNumber);
select OrderAmount, AmountPayed;
IF OrderAmount > AmountPayed THEN
SET p_HasBalanceDue = 'Yes';
ELSE
SET p_HasBalanceDue = 'No';
END IF;
SELECT (OrderAmount - AmountPayed) INTO p_AmountDue;
END //
DELIMITER ;