Question

我使用的是sql server 2008 r2。这是我的询问。

    SELECT  TOP 25 A.*, U.Displayname AS UserName,
            SU.Displayname AS SmoothieAuthorName, 
            S.Name AS SmoothieName, S.Id AS SmoothieId
    FROM    dbo.Activity AS A 
            LEFT JOIN dbo.[User] AS U ON A.UserId = U.Id
            LEFT JOIN dbo.[User] AS SU ON A.SmoothieAuthorId = SU.Id
            LEFT JOIN dbo.Smoothie AS S ON A.SmoothieId = S.Id

    WHERE   A.UserId = 2 --@UserId
            AND A.UserId <> A.SmoothieAuthorId
    ORDER BY CreatedDate DESC

以下是我的结果。现在，我需要通过SmoothieId和CreatedDate对它们进行分组（仅限组日期部分，忽略时间）。前两个应该只返回一个，3到5应该只返回一个。不知道怎么做，请帮忙。

Id  ActionType  UserId  SmoothieId  SmoothieAuthorId    CreatedDate             UserName    SmoothieAuthorName  SmoothieName    SmoothieId
1   view        2       128         1                   2013-01-15 20:05:03.403 mike        test1234            new testing 2d  128
2   view        2       128         1                   2013-01-15 20:16:24.733 mike        test1234            new testing 2d  128
12  view        2       128         1                   2013-01-16 21:45:56.167 mike        test1234            new testing 2d  128
13  view        2       128         1                   2013-01-16 22:12:51.217 mike        test1234            new testing 2d  128
14  view        2       128         1                   2013-01-16 22:12:54.407 mike        test1234            new testing 2d  128
15  view        2       69          1                   2013-01-16 22:19:54.783 mike        test1234            sdfsdfwww       69

Answer 1

如果你需要来自A的所有列，包括Id，我认为你将很难包括Id。我想你需要明确列出你所追求的A列。我还假设您想要分组您正在分组的记录，因此需要Count（TheDate）元素。

除此之外，请查看日期时间和组的getting just the date portion。

喜欢的东西;

SELECT ActionType, UserId, SmoothieId, SmoothieAuthorId,
       TheDate, Count(TheDate) AS Occurances, UserName, SmoothieAuthorName, 
       SmoothieName, SmoothieId
  FROM (
    SELECT  TOP 25 A.ActionType, A.UserId, A.SmoothieId,  
            A.SmoothieAuthorId, 
            DATEADD(dd, 0, DATEDIFF(dd, 0, CreatedDate)) AS TheDate, 
            U.Displayname AS UserName,
            SU.Displayname AS SmoothieAuthorName, 
            S.Name AS SmoothieName, S.Id AS SmoothieId
    FROM    dbo.Activity AS A 
            LEFT JOIN dbo.[User] AS U ON A.UserId = U.Id
            LEFT JOIN dbo.[User] AS SU ON A.SmoothieAuthorId = SU.Id
            LEFT JOIN dbo.Smoothie AS S ON A.SmoothieId = S.Id
    WHERE   A.UserId = 2 --@UserId
            AND A.UserId <> A.SmoothieAuthorId
    -- ORDER BY CreatedDate DESC
) x GROUP BY ActionType, UserId, SmoothieId, SmoothieAuthorId, UserName, 
             TheDate, SmoothieAuthorName, SmoothieName, SmoothieId
    ORDER BY The Date DESC

注意这未经过测试，只是我尝试的一个快速建议。

Answer 2

我不确定我完全理解这个问题。假设您需要这些列的不同值，那么只需使用DISTINCT：

SELECT DISTINCT 
    CAST(CreatedDate to Date) as DateWanted, 
    SmoothieId  
FROM 
(    
    SELECT  TOP 25 A.*, U.Displayname AS UserName,
            SU.Displayname AS SmoothieAuthorName, 
            S.Name AS SmoothieName, S.Id AS SmoothieId
    FROM    dbo.Activity AS A 
            LEFT JOIN dbo.[User] AS U ON A.UserId = U.Id
            LEFT JOIN dbo.[User] AS SU ON A.SmoothieAuthorId = SU.Id
            LEFT JOIN dbo.Smoothie AS S ON A.SmoothieId = S.Id
    WHERE   A.UserId = 2 --@UserId
            AND A.UserId <> A.SmoothieAuthorId
) t

审核您的评论，您说您需要活动表格中的所有字段。对于前2个记录，1或2，您希望在Id列中收到什么？其他列中的所有其他值是否相同？要获得单个记录，您需要选择一行而不是另一行，或者使用具有相同信息的列进行分组。

祝你好运。

需要帮助来分组我的结果

2 个答案: