Question

到目前为止，我有这个查询

select count(*) as howMany,sum(Duration) as totalTime 
from [Tmp].[dbo].[tmp2] 
group by SUBSTRING(TextData,1,25)

可以正常返回两列：howMany和totalTIme。我希望它还返回一个包含SUBSTRING（TextData，1,25）结果的列，每个组都是相同的。但是我不知道如何修改查询来完成此任务。

我还想按totalTime排序的结果，但以下尝试无法编译

select * 
from (select count(*) as howMany,sum(Duration) as totalTime 
      from [Tmp].[dbo].[tmp2] 
      group by SUBSTRING(TextData,1,25) ) 
order by totalTime;

Answer 1

select SUBSTRING(TextData,1,25),
    count(*) as howMany,
    sum(Duration) as totalTime 
from [Tmp].[dbo].[tmp2] 
group by SUBSTRING(TextData,1,25)
order by 3 --3rd column

应该做的伎俩。

Answer 2

select SUBSTRING(TextData,1,25) as textdata, count(*) as howMany,sum(Duration) as totalTime
from [Tmp].[dbo].[tmp2] 
group by SUBSTRING(TextData,1,25)
order by sum(duration)

我相信您可以将substring位添加到select语句中，并按顺序添加总和。它默认为升序，将desc放在语句的末尾以反转

通过子字符串查询组，返回子字符串结果并按组上的聚合排序

2 个答案: