我坚持我有没有能够得到合适的输出

Question

select G.region as Region 
    ,A.Name as AgencyName 
    ,A.AgencyId 
    ,sum(L.LoanAmount) as LoanAmount 
from dw.FFLoan L 
inner join dw.dimborrower B on L.BorrowerId = B.BorrowerId 
inner join dw.DIMGeography G on G.GeographyId = B.GeographyId 
inner join dw.DIMAgency A on A.AgencyId = L.Agency 
group by G.region, A.Name, A.AgencyId 
order by Region, LoanAmount desc 

查询我不能够像 得到输出首先我想先向东5 5，然后向北和向南，然后再向西。 我需要输出仅5各顶贷款金额

的区域谢谢

Answer 1

试试这个，

;With CTE as 
(
select G.region as Region 
     ,A.Name as AgencyName 
     ,A.AgencyId 
     , sum(L.LoanAmount) as LoanAmount 
     ,Row_Number() over (Partition By G.region order by sum(L.LoanAmount) desc) as RNo 
     from dw.FFLoan L 

    inner join dw.dimborrower B on L.BorrowerId = B.BorrowerId 
    inner join dw.DIMGeography G on G.GeographyId = B.GeographyId 
    inner join dw.DIMAgency A on A.AgencyId = L.Agency 
    group by G.region, A.Name, A.AgencyId 


) 
Select * from CTE 
where RNo <=5 
order by LoanAmount desc 

Answer 2

您可以使用窗口函数row_number()做到这一点。这可以通过另一列（比如sum(LoanAmount)）对组内的行（比如区域）进行排序。您可以使用窗口函数与聚合函数，所以查询的样子：

select region, AgencyName, AgencyId, LoanAmount 
from (select g.region, a.Name as AgencyName, a.AgencyId, sum(l.LoanAmount) as LoanAmount, 
      Row_Number() over (Partition By G.region order by sum(l.LoanAmount) desc) as seqnum 
     from dw.FFLoan l inner join 
      dw.dimborrower b 
      on l.BorrowerId = b.BorrowerId inner join 
      dw.DIMGeography g 
      on G.GeographyId = b.GeographyId inner join 
      dw.DIMAgency A 
      on a.AgencyId = l.Agency 
     group by g.region, a.Name, a.AgencyId 
    ) t 
where seqnum = 1 
order by region, LoanAmount desc;