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,
total_ordered
from
Orders od
left join (
select
order_num,
sum(item_price * quantity) as total_ordered
from
OrderItems
group by
order_num
) t on t.order_num = od.order_num
order by
total_ordered desc;
题目中的Orders表与输入的不是一个表，我说怎么返回None
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