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 o.cust_id,
(
select sum(q.item_price*q.quantity)
from OrderItems q
where q.order_num = o.order_num
) total_order
from Orders o
order by total_order desc
#主查询中的total_order列将子查询的结果显示为主查询的一部分。故结果集中的每一行都有相应的cust_id和计算出的total_order。
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