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
b1.cust_id cust_id,
total_ordered
from
(
select
order_num,
sum(item_price * quantity) total_ordered
from
OrderItems
group by
order_num
) a1
join Orders b1 on a1.order_num = b1.order_num
order by
total_ordered desc;
子查询返回total_ordered，通过分组聚合，等值连接
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