SQL Server DISTINCT或GROUP TEMP表

Question

我有一個復雜的問題。 這個想法是，我需要一個表中的Serv_Acct（這很簡單，我已經知道了）：

DECLARE 

 @CustomerID int = 8,
 @UtilityCompanyID int = 1


    SELECT DISTINCT SERV_ACCT, MAX(INV_DATE)
    FROM tblAPSData

    WHERE SERV_ACCT NOT IN (SELECT ServiceAccount
                FROM tblMEP_Meters
                JOIN tblMEP_Sites
                ON tblMEP_Meters.SiteID = tblMEP_Sites.ID

                JOIN tblMEP_Projects
                ON tblMEP_Projects.ID = tblMEP_Sites.ProjectID

                WHERE CustomerID = 8
                AND Type = 1
                )

    AND ACCOUNT IN (SELECT AccountNumber
                    FROM tblMEP_CustomerAccounts
                    WHERE CustomerID = @CustomerID
                    AND UtilityCompanyID = @UtilityCompanyID)

    AND INV_DATE > DATEADD(month, -6, getdate())
    GROUP BY SERV_ACCT

運行此命令時，我得到16行：

SERV_ACCT   (No column name)
0289S61288  2013-06-12 00:00:00.000
0492S90281  2013-06-12 00:00:00.000
1303S90280  2013-06-12 00:00:00.000
1435S01282  2013-06-12 00:00:00.000
1440S13289  2013-06-24 00:00:00.000
1548S00286  2013-06-12 00:00:00.000
2498S21288  2013-06-12 00:00:00.000
5384S92284  2013-06-24 00:00:00.000
5538S21284  2013-06-12 00:00:00.000
6109S12286  2013-06-12 00:00:00.000
7358S00281  2013-06-12 00:00:00.000
7488S22289  2013-06-12 00:00:00.000
8058S12287  2013-06-12 00:00:00.000
9058S00288  2013-06-12 00:00:00.000
9168S00282  2013-06-12 00:00:00.000
9645S21281  2013-06-12 00:00:00.000

現在，我沒有得到的部分是，每個服務帳戶都有一個帳號，並且某些服務帳戶具有多個帳號，我只想要帶有一個最新日期的服務帳號。 當我嘗試以這種方式查看問題：

DECLARE 

 @CustomerID int = 8,
 @UtilityCompanyID int = 1


    SELECT DISTINCT SERV_ACCT, ACCOUNT, MAX(INV_DATE)
    FROM tblAPSData

    WHERE SERV_ACCT NOT IN (SELECT ServiceAccount
                FROM tblMEP_Meters
                JOIN tblMEP_Sites
                ON tblMEP_Meters.SiteID = tblMEP_Sites.ID

                JOIN tblMEP_Projects
                ON tblMEP_Projects.ID = tblMEP_Sites.ProjectID

                WHERE CustomerID = 8
                AND Type = 1
                )

    AND ACCOUNT IN (SELECT AccountNumber
                    FROM tblMEP_CustomerAccounts
                    WHERE CustomerID = @CustomerID
                    AND UtilityCompanyID = @UtilityCompanyID)

    AND INV_DATE > DATEADD(month, -6, getdate())
    GROUP BY SERV_ACCT, ACCOUNT
    ORDER BY SERV_ACCT

現在的結果如下：

SERV_ACCT   ACCOUNT (No column name)
0289S61288  117512280   2013-06-12 00:00:00.000
0492S90281  117512280   2013-06-12 00:00:00.000
0492S90281  651412281   2013-04-08 00:00:00.000
1303S90280  117512280   2013-06-12 00:00:00.000
1435S01282  117512280   2013-06-12 00:00:00.000
1440S13289  312937281   2013-06-24 00:00:00.000
1548S00286  117512280   2013-06-12 00:00:00.000
1548S00286  308710287   2013-04-08 00:00:00.000
2498S21288  117512280   2013-06-12 00:00:00.000
5384S92284  979437282   2013-06-24 00:00:00.000
5538S21284  117512280   2013-06-12 00:00:00.000
6109S12286  117512280   2013-06-12 00:00:00.000
7358S00281  117512280   2013-06-12 00:00:00.000
7358S00281  659710281   2013-04-08 00:00:00.000
7488S22289  117512280   2013-06-12 00:00:00.000
8058S12287  117512280   2013-06-12 00:00:00.000
9058S00288  117512280   2013-06-12 00:00:00.000
9168S00282  117512280   2013-06-12 00:00:00.000
9168S00282  570810282   2013-04-08 00:00:00.000
9645S21281  117512280   2013-06-12 00:00:00.000

如您所見，Serv_Acct不再不同了！ 我的目標是僅使用最新帳戶獲取唯一的Serv_Acct（16）。 有什么幫助嗎？ 我問一個朋友，她告訴我我可以用臨時表來做！ 真的嗎？

Answer 1

嘗試使用您列出的第一個查詢作為子查詢，並將其加入tblapsdata。 它看起來像這樣：

DECLARE 

 @CustomerID int = 8,
 @UtilityCompanyID int = 1

SELECT MD.SERV_ACCT, AD.ACCOUNT, MD.MAXINVDATE
FROM
(SELECT DISTINCT SERV_ACCT, MAX(INV_DATE) as MAXINVDATE
FROM tblAPSData

WHERE SERV_ACCT NOT IN (SELECT ServiceAccount
            FROM tblMEP_Meters
            JOIN tblMEP_Sites
            ON tblMEP_Meters.SiteID = tblMEP_Sites.ID

            JOIN tblMEP_Projects
            ON tblMEP_Projects.ID = tblMEP_Sites.ProjectID

            WHERE CustomerID = 8
            AND Type = 1
            )

AND ACCOUNT IN (SELECT AccountNumber
                FROM tblMEP_CustomerAccounts
                WHERE CustomerID = @CustomerID
                AND UtilityCompanyID = @UtilityCompanyID)

AND INV_DATE > DATEADD(month, -6, getdate())
GROUP BY SERV_ACCT) MD
join tblAPSdata AD on MD.SERV_ACCT = AD.SERV_ACCT and MD.MAXINVDATE = AD.INV_DATE

請注意，這將僅返回原始查詢中的記錄，但將附加適當的帳號。 請注意，如果您有多個具有相同日期的帳號，則將返回更多記錄。