题解 | 返回每个顾客不同订单的总金额
select cust_id,sum(item_price*quantity) total_ordered from Orders s1,OrderItems s2 where s1.order_num=s2.order_num group by cust_id order by total_ordered desc
select cust_id,sum(item_price*quantity) total_ordered from Orders s1,OrderItems s2 where s1.order_num=s2.order_num group by cust_id order by total_ordered desc
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