Question

我正在尝试alldocs中的所有文件（其中siteid = something和checkout不为null）。 Alldocs有一个调用checkoutuserid的字段，我需要从userinfo表中获取名称。 UserInfo可能重复相同的ID，这就是我添加site-id的原因。我在以下查询中收到错误。＆＃34;子查询返回的值超过1）

SELECT AllDocs.LeafName
     , AllDocs.CheckoutDate
     , UserInfo.tp_Title AS [User Name]
     , UserInfo.tp_Login AS [User ID]
     , UserInfo.tp_Email
FROM AllDocs
INNER JOIN UserInfo ON AllDocs.CheckoutUserId = (
        SELECT UserInfo.tp_ID
        FROM UserInfo
        WHERE UserInfo.tp_SiteID = 'E2FF98A7-B719-428D-8C30-856F08989691'
    )
WHERE (AllDocs.SiteId = 'E2FF98A7-B719-428D-8C30-856F08989691')
    AND (AllDocs.CheckoutUserId IS NOT NULL)
ORDER BY AllDocs.LeafName

我正在添加以下工作代码，因为我已在查询中添加了第3个表。以下是完美的工作。

use WSS_Content_MMRHome1
SELECT     distinct AllDocs.LeafName AS [File Name], AllDocs.dirName AS [Path], AllDocs.CheckoutDate, 
           UserInfo.tp_Title AS [User Name], UserInfo.tp_Login AS [User ID], 
           UserInfo.tp_Email AS [User Email], AllLists.tp_Title AS [List Name], ('http://inside.nv.com/'+AllDocs.DirName+'/'+AllDocs.LeafName) AS URL
FROM       AllDocs 
           INNER JOIN UserInfo ON AllDocs.CheckoutUserId = UserInfo.tp_ID AND UserInfo.tp_SiteID = AllDocs.SiteId
           INNER JOIN AllLists ON AllDocs.ListId = AllLists.tp_ID
WHERE      AllDocs.SiteId = 'D36CCEA0-5351-4AEC-8B83-ACA2439CF38B'
                AND AllDocs.CheckoutUserId IS NOT NULL
ORDER BY AllDocs.LeafName

Answer 1

不需要子查询，只需将其他条件移至join（或包含在where子句中）：

SELECT     distinct AllDocs.LeafName, AllDocs.CheckoutDate, 
           UserInfo.tp_Title AS [User Name], UserInfo.tp_Login AS [User ID], 
           UserInfo.tp_Email
FROM       AllDocs INNER JOIN
           UserInfo ON AllDocs.CheckoutUserId = UserInfo.tp_ID 
                AND UserInfo.tp_SiteID = 'E2FF98A7-B719-428D-8C30-856F08989691'
WHERE      AllDocs.SiteId = 'E2FF98A7-B719-428D-8C30-856F08989691'
                AND AllDocs.CheckoutUserId IS NOT NULL
ORDER BY AllDocs.LeafName

实际上看起来像是同一个网站ID？如果是这样，也可以加入该领域：

...
FROM       AllDocs INNER JOIN
           UserInfo ON AllDocs.CheckoutUserId = UserInfo.tp_ID 
                AND UserInfo.tp_SiteID = AllDocs.SiteId
WHERE      AllDocs.SiteId = 'E2FF98A7-B719-428D-8C30-856F08989691'
                AND AllDocs.CheckoutUserId IS NOT NULL
ORDER BY AllDocs.LeafName

SQL查询连接表 - 子查询返回的值超过1

1 个答案: