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 oi
    WHERE oi.order_num = o.order_num
    GROUP BY oi.order_num
) AS total_ordered
FROM Orders o
ORDER BY total_ordered DESC;

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