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
http://www.nowcoder.com/practice/ce313253a81c4947b20e801cd4da7894
SELECT
o.cust_id as cust_id , tb.total_ordered as total_ordered
from
(
select
a.order_num,
SUM(a.item_price * a.quantity) as total_ordered
from
OrderItems a
group by
a.order_num
) tb,
Orders o
where
tb.order_num = o.order_num
order by
tb.total_ordered desc
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