题解 | #返回每个顾客不同订单的总金额#
返回每个顾客不同订单的总金额
https://www.nowcoder.com/practice/ce313253a81c4947b20e801cd4da7894
SELECT cust_id,
(
SELECT SUM(quantity*item_price)
FROM OrderItems
WHERE OrderItems.order_num = Orders.order_num
) AS total_ordered
FROM Orders
ORDER BY total_ordered DESC;
