Question

我如何连接2个字段，但我也有CASE条件。这是我的sql：

INSERT INTO #TempTable([Name],[TotalBets])
SELECT      CASE
                WHEN @Limited ='All'
                    THEN DPL.[FirstName]
                WHEN @Limited ='Blind_No'                   
                    THEN DPL.[FirstName]            
                ELSE '*****'
                END AS DPL.[FirstName] + ' ' + 
            CASE
                WHEN @Limited ='All'
                    THEN DPL.[LastName]
                WHEN @Limited ='Blind_No'
                    AND [BlindAccount] = 1
                    THEN '*****'
                WHEN @Limited ='Blind_No'
                    AND [BlindAccount] = 0
                    THEN DPL.[LastName]
                ELSE '*****'
                END AS DPL.[LastName] [Name],
        SUM(FWA.TotalBetAmount)                     [TotalBets]     
    FROM [WarehouseMgmt].[FactWalletAgr] FWA
    JOIN [WarehouseMgmt].[DimPlayer] DPL ON FWA.[PlayerId] = DPL.[Id]
    JOIN [WarehouseMgmt].[DimGame] DG ON FWA.[GameId] = DG.[Id] 
GROUP BY DPL.[FirstName] + ' ' + DPL.[LastName]

但是这个查询是错误的，当我有CASE条件时我不知道如何连接。有任何帮助或建议吗？

Answer 1

您不能在group by子句中使用别名。我已经改变了它，如下所示。如果您使用的是sql server 2008的上述版本，请使用concat函数。连接两个字符串连接有时会导致NULL。

INSERT INTO #TempTable([Name],[TotalBets])
    SELECT     ( CASE
                    WHEN @Limited ='All'
                        THEN DPL.[FirstName]
                    WHEN @Limited ='Blind_No'                   
                        THEN DPL.[FirstName]            
                    ELSE '*****'
                    END) + ' ' + 
               ( CASE
                    WHEN @Limited ='All'
                        THEN DPL.[LastName]
                    WHEN @Limited ='Blind_No'
                        AND [BlindAccount] = 1
                        THEN '*****'
                    WHEN @Limited ='Blind_No'
                        AND [BlindAccount] = 0
                        THEN DPL.[LastName]
                    ELSE '*****'
                    END ) [Name],
            SUM(FWA.TotalBetAmount)                     [TotalBets]     
        FROM [WarehouseMgmt].[FactWalletAgr] FWA
        JOIN [WarehouseMgmt].[DimPlayer] DPL ON FWA.[PlayerId] = DPL.[Id]
        JOIN [WarehouseMgmt].[DimGame] DG ON FWA.[GameId] = DG.[Id] 
    GROUP BY    ( CASE
                    WHEN @Limited ='All'
                        THEN DPL.[FirstName]
                    WHEN @Limited ='Blind_No'                   
                        THEN DPL.[FirstName]            
                    ELSE '*****'
                    END) + ' ' + 
               ( CASE
                    WHEN @Limited ='All'
                        THEN DPL.[LastName]
                    WHEN @Limited ='Blind_No'
                        AND [BlindAccount] = 1
                        THEN '*****'
                    WHEN @Limited ='Blind_No'
                        AND [BlindAccount] = 0
                        THEN DPL.[LastName]
                    ELSE '*****'
                    END )

Answer 2

在派生表中执行case和连接。 Group by结果。

select [Name], sum(TotalBetAmount) as [TotalBets]
from
(
SELECT      CASE
                WHEN @Limited ='All'
                    THEN DPL.[FirstName]
                WHEN @Limited ='Blind_No'                   
                    THEN DPL.[FirstName]            
                ELSE '*****'
                END + ' ' + 
            CASE
                WHEN @Limited ='All'
                    THEN DPL.[LastName]
                WHEN @Limited ='Blind_No'
                    AND [BlindAccount] = 1
                    THEN '*****'
                WHEN @Limited ='Blind_No'
                    AND [BlindAccount] = 0
                    THEN DPL.[LastName]
                ELSE '*****'
                END AS [Name],
            FWA.TotalBetAmount AS TotalBetAmount 
    FROM [WarehouseMgmt].[FactWalletAgr] FWA
    JOIN [WarehouseMgmt].[DimPlayer] DPL ON FWA.[PlayerId] = DPL.[Id]
    JOIN [WarehouseMgmt].[DimGame] DG ON FWA.[GameId] = DG.[Id] 
) dt
GROUP BY [Name]

Answer 3

您的查询的一个问题是表达式中间的as - 以及使用带有句点的别名。也许这解决了你的问题：

INSERT INTO #TempTable([Name],[TotalBets])
    SELECT ( (CASE WHEN @Limited = 'All' THEN DPL.[FirstName]
                   WHEN @Limited = 'Blind_No' THEN DPL.[FirstName]            
                   ELSE '*****'
              END)+ ' ' + 
              (CASE WHEN @Limited = 'All' THEN DPL.[LastName]
                    WHEN @Limited = 'Blind_No' AND [BlindAccount] = 1 THEN '*****'
                    WHEN @Limited ='Blind_No' AND [BlindAccount] = 0
                    THEN DPL.[LastName]
              ELSE '*****'
             END)
            ) as [Name],
            SUM(FWA.TotalBetAmount) as [TotalBets]     
    FROM [WarehouseMgmt].[FactWalletAgr] FWA JOIN
         [WarehouseMgmt].[DimPlayer] DPL
         ON FWA.[PlayerId] = DPL.[Id] JOIN
         [WarehouseMgmt].[DimGame] DG
         ON FWA.[GameId] = DG.[Id] 
    GROUP BY DPL.[FirstName] + ' ' + DPL.[LastName];

这假设您不想将＆＃34;盲人＆＃34;将名称分成一行。

用case条件连接两个字段

3 个答案: