Sql server 2008 使用GroupBy的和的顶部

此查询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                                     

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下一步是查找这些行的顶部（1）。我知道我不能使用嵌套聚合，但我想这样做：

选择图书编号、顶（1）和（数量*订单价格）作为TopSeller

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建议？

你好，塞吉奥，非常感谢。作为一个新手，我很接近，但后来（非常）迷失在细节中。如果它对你有用，请投票回答并选择“接受”

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

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