使用GroupBy的总和

Question

此查询可以工作并生成以下数据：

select book_id, sum(quantity*order_price) as TExtCost
from bkorders.order_details
group by book_id
order by sum(quantity*order_price) desc

book_id                    TExtCost                                     

---

   1128                                31909.34
   1401                                29966.00
   1108                                28410.30
.
.
.

下一步是找到这些行的顶部（1）。我知道我不能使用嵌套聚合，但我想这样做：

选择book_id，top（1）sum（quantity * order_price））作为TopSeller

建议？

Answer 1

select top 1 * from (
select book_id, sum(quantity*order_price) as TExtCost
from bkorders.order_details
group by book_id
) a order by TExtCost desc