先分组求和再排序并取前3名解决方法

先分组求和再排序并取前3名
select top 3 ppp from (select sum(应付金额) as ppp from sell group by 型号) order by ppp desc
请各位高手看看，这究竟出了什么错

------解决方案--------------------

探讨

select top 3 ppp from (select sum(应付金额) as ppp from sell group by 型号) order by ppp desc
请各位高手看看，这究竟出了什么错