sql - Access SQL - 在计数查询中显示附加列

Question

我正在尝试获取重复项的详细列表，Foldername 是重复值。我需要重复实例和其他相应列的计数，例如每个重复实例的 FullPath。

我正在尝试返回每个完整路径的列表及其相应的文件夹名称计数，以及其他列，如单位、大小等。

FolderName (has the possibility of a duplicate)
FullPath (is completly unique)

我对此进行了一些尝试；在 SQL Server 中，这似乎更明显……但在 Access 中，我有点迷路了。

这是我到目前为止想出的基本 SQL:

    /* ''''''''''''''Works but doesn't return Count'''''''''''''' */
Select Snapshot.Unit, Snapshot.FolderName, Snapshot.FullPath
From Snapshot
Where Snapshot.FolderName in 
(
    Select Snapshot.FolderName
    From Snapshot
    Group by Snapshot.Foldername
    Having Count(Snapshot.FolderName)> 1
)
Order by Snapshot.FolderName, Snapshot.FullPath

这是我想要获得的示例输出:

Unit       FolderName     FullPath                          Count
BCU        Misc           C:\blah\blah\blah\Misc            2
ENV        Misc           R:\blah\blah\blah\Misc            2
CLR        Monkey         Q:\blah\blah\blah\blah\Monkey     17
ATL        Zebra          Z:\blah\blah\zoo\Zebra            24

我引用了: Having trouble using count() in Access SQL query

Answer 1

在您的子查询中进行计数，并将 INNER JOIN 快照生成到子查询。

SELECT s.Unit, s.FolderName, s.FullPath, sub.num_dupes
FROM
    Snapshot AS s
    INNER JOIN
    (
        SELECT FolderName, Count(*) AS num_dupes
        FROM Snapshot
        GROUP BY FolderName
        HAVING Count(*)> 1
    ) AS sub
    ON s.FolderName = sub.FolderName
ORDER BY s.FolderName, s.FullPath