SQL 仅联接一对多关系中的一条记录

发布于 2024-11-07 06:31:23 字数 723 浏览 0 评论 0原文

我有以下查询：

SELECT c.[ClientID]
        ,u.[AccessId]
 FROM [tblClient] c
 INNER JOIN [tblUser] u ON u.[Id] = c.[UserId]

此 tblUser 每个 UserID 行都有多个 ID。

所以它看起来像这样：

UserID    AccessID
1           AD2F0A-965B78414-2B34906F2-0127AA5A
1           ID2F0A9-65B784-142B34906-F20127AA5A
1           UD2F0A9-65B78-4142B34906F-20127AA5A
2           TD2F0A9-65B784142-B34906F-20127AA5A
2           RD2F0A9-65B784142B3-4906-F20127AA5A
3           WD2F0A96-5B784142-B34906F201-27AA5A 
3           ZD2F0A96-5B784-142B34-906F2-0127AA5A
3           CD2F0A965-B784142B3-4906F20-127AA5A

有没有办法只获取每个 UserID 的顶部（或 1）AccessId？我获得哪个 AccessID 并不重要，我只想要其中 1 个。

谢谢

原文

I have the following query:

SELECT c.[ClientID]
        ,u.[AccessId]
 FROM [tblClient] c
 INNER JOIN [tblUser] u ON u.[Id] = c.[UserId]

This tblUser has multiple ID's for each UserID row.

So it would look like this:

UserID    AccessID
1           AD2F0A-965B78414-2B34906F2-0127AA5A
1           ID2F0A9-65B784-142B34906-F20127AA5A
1           UD2F0A9-65B78-4142B34906F-20127AA5A
2           TD2F0A9-65B784142-B34906F-20127AA5A
2           RD2F0A9-65B784142B3-4906-F20127AA5A
3           WD2F0A96-5B784142-B34906F201-27AA5A 
3           ZD2F0A96-5B784-142B34-906F2-0127AA5A
3           CD2F0A965-B784142B3-4906F20-127AA5A

Is there a way to only get the top(or 1) AccessId for each UserID? It doesnt matter which AccessID i get, I just want 1 of them.

Thanks

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夏天碎花小短裙 2024-11-14 06:31:23

SELECT c.[ClientID], MAX(u.[AccessId]) 
    FROM [tblClient] c 
        INNER JOIN [tblUser] u 
            ON u.[Id] = c.[UserId]
    GROUP BY c.[ClientID]

SELECT c.[ClientID], MAX(u.[AccessId]) 
    FROM [tblClient] c 
        INNER JOIN [tblUser] u 
            ON u.[Id] = c.[UserId]
    GROUP BY c.[ClientID]

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