SSMS：每个属性供应商总数的发票总数

Question

我不是 SQL 专家，我从“建筑属性”中提取发票数量的查询应该吞吐每个属性的发票总数和供应商总数。我试过以下查询，你能推荐一些具有类似结果的东西吗？

[脚本查询]

SELECT property, count(distinct InvoiceNo) as Total Number of Invoices 
From dbo.Invoices
Where tstamp >= '2020-01-01'
Group By InvoiceNo;

所需的输出数据

   Total Number of Invoices | Frequently Used Vendors |  Property
   200                      | Name of Vendor          |  Property Name

Answer 1

我认为您想要每个属性的顶级供应商。如果是这样，你可以这样做：

select *
from (
    select property, vendor, count(*) cnt_invoices,
        rank() over(partition by property order by count(*) desc) rn 
    from dbo.invoices
    where tstamp >= '2020-01-01'
    group by property, vendor
) t
where rn = 1
order by property

这允许顶级关系（如果有的话）。您可以使用 with ties 和 order by:

获得相同的结果

select top (1) with ties property, vendor, count(*) cnt_invoices
from dbo.invoices
where tstamp >= '2020-01-01'
group by property, vendor
order by rank() over(partition by property order by count(*) desc)

SSMS：每个属性供应商总数的发票总数

SSMS: Total invoice count from total vendors per property

sql

sql-server

ssms

aggregate-functions

greatest-n-per-group

SSMS：每个 属性 供应商总数的发票总数

SSMS: Total invoice count from total vendors per property

sql

sql-server

ssms

aggregate-functions

greatest-n-per-group

SSMS：每个属性供应商总数的发票总数