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/*
BalanceDue(customerNumber, @HasBalanceDue, @AmountDue)
Returns: @HasBalanceDue as 'Yes' if the customer has a balance remaining, else 'No'.
@AmountDue as any amount unpaid.
Usage: BalanceDue(customerNumber, @HasBalanceDue, @AmountDue);
*/
USE classicmodels;
DROP PROCEDURE IF EXISTS BalanceDue;
DELIMITER $$
CREATE PROCEDURE BalanceDue(
IN p_customerNumber int(11),
OUT p_HasBalanceDue varchar(3),
OUT p_AmountDue DOUBLE
)
BEGIN
DECLARE totalAmountDue DOUBLE;
DECLARE totalPayments DOUBLE;
SELECT CONVERT(SUM(quantityOrdered * priceEach),DECIMAL(8,2)) INTO totalAmountDue
FROM orderdetails
JOIN orders ON orders.orderNumber = orderdetails.orderNumber
WHERE orders.customerNumber = p_customerNumber;
SELECT CONVERT(SUM(amount),DECIMAL(8,2)) INTO totalPayments
FROM payments
WHERE payments.customerNumber = p_customerNumber;
IF ( totalAmountDue > totalPayments ) THEN
SET p_HasBalanceDue = "Yes";
SET p_AmountDue = CONVERT( totalAmountDue - totalPayments, DECIMAL(8,2) );
ELSE
SET p_HasBalanceDue = "No";
SET p_AmountDue = 0;
END IF;
# UNCOMMENT line below to debug values.
#SELECT customerNumber, customerName, p_HasBalanceDue, p_AmountDue, CONVERT(totalAmountDue,DECIMAL(8,2)), CONVERT(totalPayments,DECIMAL(8,2)) FROM customers WHERE customerNumber = p_customerNumber;
END$$
DELIMITER ;