SQL Server：组合类似的行

Question

我有以下疑问：

SELECT DISTINCT [WL].[Id]
  ,[WL].[UserId]
  ,[WL].[DIF]
  ,[WL].[MW]
  ,[WL].[Notes]
  ,[WL].[WDate]
  ,[WL].[CB]
  ,[WL].[MPH] 
  ,[U].[Id]
  ,[U].[UserName]
  ,[U].[We]
  ,[U].[SLength]
  ,[U].[UP]
  ,[U].[PU]
  ,[U].[ANumber]
  ,[U].[G_CK]
FROM 
    [Wsite].[dbo].[WLog] as WL 
INNER JOIN 
    [Wsite].[dbo].[Users] AS U ON [U].[Id] = [WL].[UserId] 
WHERE 
    [WL].[WDate] >= CONVERT(datetime, '2012-01-01 00:00:00', 120)  
    AND [WL].[WDate] <= CONVERT(datetime, GETDATE(), 120)
GROUP BY 
    [WL].[UserId]

我得到的错误是：

选择中的列“Wsite.dbo.WLog.Id”无效 列表，因为它既不包含在聚合函数中，也不包含在聚合函数中 GROUP BY 子句。

如果列表中有多个UserID，我想要的只是合并数据。

举个例子：

Id  | UserId | .... | Id   | UserName    | SLength | ....
5843| 99304  | .... | 99304| Bob Barker  | 14      | ....
5844| 06300  | .... | 06300| Dean Martin | 104     | ....
5845| 99304  | .... | 99304| Bob Barker  | 8       | ....
5846| 99304  | .... | 99304| Bob Barker  | 11      | ....
5847| 7699   | .... | 7699 | John Doe    | 0       | ....

所以它应该是这样的：

Id  | UserId | .... | Id   | UserName    | SLength | ....
5843| 99304  | .... | 99304| Bob Barker  | 33      | ....
5844| 06300  | .... | 06300| Dean Martin | 104     | ....
5847| 7699   | .... | 7699 | John Doe    | 0       | ....

请注意，Bob Barker 的 SLength 已合并 (14+8+11=33)。

任何帮助都会很棒！谢谢！

更新

SELECT DISTINCT 
   MIN([WL].[Id]) AS [WLID]
  ,MIN([WL].[UserId]) AS [WLUD]
  ,SUM([WL].[DIF]) AS [DIF]
  ,SUM([WL].[MW]) AS [MW]
  ,[WL].[Notes]
  ,[WL].[WDate]
  ,SUM([WL].[CB]) AS [CB]
  ,SUM([WL].[MPH])  AS [MPH]
  ,MIN([U].[Id] AS [UID]
  ,MIN([U].[UserName] AS [UUserName]
  ,[U].[We]
  ,SUM([U].[SL]) AS [SL]
  ,[U].[UP]
  ,[U].[PU]
  ,[U].[ANumber]
  ,[U].[G_CK]
  FROM [Wsite].[dbo].WLog as WL 
INNER JOIN [Wsite].[dbo].[Users] AS U 
    ON [U].[Id] = [WL].[UserId] 
 WHERE [WL].[WDate] >= CONVERT(datetime, '2012-01-01 00:00:00', 120)  
   AND [WL].[WDate] <= CONVERT(datetime, GETDATE(), 120)
GROUP BY 
   [WL].[Notes]
  ,[WL].[WDate]
  ,[U].[We]
  ,[U].[UP]
  ,[U].[PU]
  ,[U].[ANumber]
  ,[U].[G_CK]
ORDER BY [U].[UserName] DESC

Answer 1

当您使用 GROUP BY 时，这意味着您想要将相似的元素组合在一起，并呈现您想要显示的剩余项目的某种聚合（COUNT、SUM、MIN 等）。因此，如果您在选择列表中包含 [WL].[Id]，您基本上将获得完整的选择而无需任何聚合（因为 [WL].[Id] 是唯一的）。

您需要执行以下操作：

SELECT MIN([WL].[Id]) AS ID
  ,[WL].[UserId]
  ,[U].[Id]
  ,[U].[UserName]
  ,SUM([SLength]) AS SLength
FROM [Wsite].[dbo].[WLog] as WL 
INNER JOIN [Wsite].[dbo].[Users] AS U 
        ON [U].[Id] = [WL].[UserId] 
     WHERE [WL].[WDate] >= CONVERT(datetime, '2012-01-01 00:00:00', 120)  
       AND [WL].[WDate] <= CONVERT(datetime, GETDATE(), 120)
  GROUP BY [WL].[UserId]
  ,[U].[Id]
  ,[U].[UserName]

（为简洁起见，我没有包括所有字段）。

还请注意，由于 [WL].[Id] 似乎是唯一的，因此在这种情况下它是没有意义的，除非您想显示它的第一次出现（然后您可以将 MIN([WL].[Id]) 添加到SELECT 列表）。

Answer 2

不确定，但这可能适用于您的情况。

SELECT DISTINCT [WL].[Id]
  ,[WL].[UserId]
  ,[WL].[DIF]
  ,[WL].[MW]
  ,[WL].[Notes]
  ,[WL].[WDate]
  ,[WL].[CB]
  ,[WL].[MPH] 
  ,[U].[Id]
  ,[U].[UserName]
  ,[U].[We]
  ,SUM([U].[SLength]) OVER (PARTITION BY [WL].[UserId])
  ,[U].[UP]
  ,[U].[PU]
  ,[U].[ANumber]
  ,[U].[G_CK]
          FROM [Wsite].[dbo].[WLog] as WL 
    INNER JOIN [Wsite].[dbo].[Users] AS U 
            ON [U].[Id] = [WL].[UserId] 
         WHERE [WL].[WDate] >= CONVERT(datetime, '2012-01-01 00:00:00', 120)  
           AND [WL].[WDate] <= CONVERT(datetime, GETDATE(), 120)

Answer 3

如果您使用GROUP BY，则必须以某种方式聚合不在分组中的任何列（SUM、MIN、MAX 等）

试试这个：

SELECT 
   [WL].[Id]
  ,[WL].[UserId]
  ,[WL].[DIF]
  ,[WL].[MW]
  ,[WL].[Notes]
  ,[WL].[WDate]
  ,[WL].[CB]
  ,[WL].[MPH] 
  ,Sum ([U].[SLength]) SLength
FROM [Wsite].[dbo].[WLog] as WL 
INNER JOIN [Wsite].[dbo].[Users] AS U 
    ON [U].[Id] = [WL].[UserId] 
WHERE [WL].[WDate] >= CONVERT(datetime, '2012-01-01 00:00:00', 120)  
    AND [WL].[WDate] <= CONVERT(datetime, GETDATE(), 120)
GROUP BY 
   [WL].[Id]
  ,[WL].[UserId]
  ,[WL].[DIF]
  ,[WL].[MW]
  ,[WL].[Notes]
  ,[WL].[WDate]
  ,[WL].[CB]
  ,[WL].[MPH] 

以下是您可以使用的聚合函数：

http://msdn.microsoft.com/en-us/library/ms173454.aspx

Answer 4

您对GROUP BY 的使用不正确。 SELECT 中使用的所有列都应该在 GROUP BY 子句中或者应该是聚合函数。
您的查询应该如下所示。

SELECT DISTINCT MIN([WL].[Id]) [Id]
    ,[WL].[UserId]
    ,[WL].[DIF]
    ,[WL].[MW]
    ,[WL].[Notes]
    ,[WL].[WDate]
    ,[WL].[CB]
    ,[WL].[MPH] 
    ,[U].[Id]
    ,[U].[UserName]
    ,[U].[We]
    ,SUM([U].[SLength]) SLength
    ,[U].[UP]
    ,[U].[PU]
    ,[U].[ANumber]
    ,[U].[G_CK]
FROM [Wsite].[dbo].[WLog] as WL 
    INNER JOIN [Wsite].[dbo].[Users] AS U 
        ON [U].[Id] = [WL].[UserId] 
WHERE [WL].[WDate] >= CONVERT(datetime, '2012-01-01 00:00:00', 120)  
       AND [WL].[WDate] <= CONVERT(datetime, GETDATE(), 120)
GROUP BY [WL].[UserId]
    ,[WL].[DIF]
    ,[WL].[MW]
    ,[WL].[Notes]
    ,[WL].[WDate]
    ,[WL].[CB]
    ,[WL].[MPH] 
    ,[U].[Id]
    ,[U].[UserName]
    ,[U].[We]
    ,[U].[UP]
    ,[U].[PU]
    ,[U].[ANumber]
    ,[U].[G_CK]