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
group by
order_num
) as total_ordered
from
Orders
order by
total_ordered desc;
把字段当作查询结果的子查询 不需要使用where in 了， 直接将查询结果作为一个字段返回
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，不说了，我又接了一单