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(item_price*quantity)
FROM OrderItems AS OI
WHERE OI.order_num=O.order_num) AS total_ordered
FROM Orders AS O
ORDER BY total_ordered DESC
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