在Sql Server中按一列分组,在聚合函数或GROUP BY子句中不包含按另一列排序

问题描述

我有带有两列关键字和事件日期的“ ApplicationEventsSearch”表 我想查询一个以返回结果作为关键字,但由EventDate按升序排序的查询 我尝试了很多组合,但是都没有用

数据

Keyword EventDate
123457  2020-09-01
123457fdfdfdfd  2020-09-01
123457fdfdfdfd  2020-09-02
123457fdfdfdfd  2020-09-03

所需结果

1-123457fdfdfdfd,2-123457

以及到目前为止我已经尝试过的

SELECT 
       [Keyword],EventDate
  FROM [NavaarDb-Dev].[dbo].[ApplicationEventsSearch]
  group by Keyword,EventDate
 order by EventDate


SELECT 
      distinct [Keyword],EventDate
 order by EventDate

解决方法

MIN中只是MAXORDER BY之后的您吗?

SELECT Keyword
FROM dbo.YourTable
GROUP BY KeyWord
ORDER BY MAX(EventDate) ASC;
,

这回答了问题

数据

drop table if exists #tTEST;
go
select * INTO #tTEST from (values 
('123457','2020-09-01'),('123457fdfdfdfd','2020-09-02'),'2020-09-03')) V(Keyword,EventDate);

查询

;with kw_cte as (select *,row_number() over (partition by Keyword order by EventDate desc) rn from #tTEST)
select
  concat_ws('-',row_number() over (order by EventDate desc),Keyword) string
from kw_cte 
where rn=1;

结果

string
1-123457fdfdfdfd
2-123457