按组外的列排序

Question

我试图按我不想在 Group By 子句中使用的列进行排序。

所以这里的想法是能够通过这个FileId来订购。

SELECT FileGuid, FileName, ROW_NUMBER() OVER(Order by FileId) AS rownum
FROM dbo.FileImport
GROUP BY FileGuid, FileName
ORDER BY rownum

现在我收到这个错误：

Column 'dbo.FileImport.FileId' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

但是如果我将其包含在分组依据中，我将获得与该 FileGuid 关联的每个文件的记录，这是我不希望发生的。在此先感谢您提供有关如何使它正常工作的任何意见。

Answer 1

你可以试试这个:

SELECT * FROM 
(SELECT FileGuid, FileName, ROW_NUMBER() OVER(Partition by FileGuid, FileName
Order by FileId) AS rownum
FROM dbo.FileImport) X
WHERE rownum = <<your condition>>
ORDER BY X.FileGuid,X.FileName,X.rownum

通过添加外部 where 子句，任何类型的过滤器都可以应用于 rownum。

Answer 2

您必须决定您关心哪个 fileid。然后你可以使用聚合函数：

SELECT FileGuid, FileName, ROW_NUMBER() OVER (Order by MIN(FileId)) AS rownum
FROM dbo.FileImport
GROUP BY FileGuid, FileName
ORDER BY rownum;

Answer 3

您可以使用此 SQL 语句。

Select *
From 
(
  SELECT T.FileGuid, T.FileName, ROW_NUMBER() OVER(Order by T.FileId) AS rownum 
  from (
     SELECT FileGuid, FileName, Max(FileID) As FileID
     FROM dbo.FileImport
     GROUP BY FileGuid, FileName
  )T
)Temp
order by Temp.rownum

如有问题请告诉我！

按组外的列排序

Order by Column Outside of Group By

tsql

sql-server

sql-order-by