Question

如何识别3个最重要（收入最高）的城市，并按照这些城市显示3个顶级类别的细分。

我从事Adventureworkslt2014的工作。

这是我的查询，但我从同一城市获得了最好的三笔交易：

select top 3 sum(TotalDue) as bestrevenue,city,pc.Name 
from SalesLT.ProductCategory as pc
join SalesLT.Product p 
on pc.ProductCategoryID =p.ProductCategoryID
join SalesLT.SalesOrderDetail as sod
on sod.ProductID=p.ProductID 
join SalesLT.SalesOrderHeader as soh 
on soh.SalesOrderID = soh.SalesOrderID
join SalesLT.[Address] addr
on addr.AddressID = soh.BillToAddressID
group by city,pc.Name
order by bestrevenue desc`

我应该获得9行的预期结果，每三行有一个城市，它的销售量最高，也是哪个类别的销售量最高的。

Answer 1

尝试一下：

select t.*
from(select city, pc.Name, sum(TotalDue) as bestrevenue,
            row_number() OVER(partition by city,Name ORDER BY sum(TotalDue) desc) as RN 
     from SalesLT.ProductCategory as pc join 
          SalesLT.Product p 
          on pc.ProductCategoryID =p.ProductCategoryID join 
          SalesLT.SalesOrderDetail as sod
          on sod.ProductID=p.ProductID join 
          SalesLT.SalesOrderHeader as soh 
          on soh.SalesOrderID = soh.SalesOrderID join 
          SalesLT.[Address] addr
          on addr.AddressID = soh.BillToAddressID
     group by city,pc.Name
    ) t
where RN <= 3;

对这个问题的正确查询是什么？

1 个答案: