Question

我在SQL服务器中有一个视图，用于通过连接将数据下载到Access中。目的是对公司数据库和我自己的所有记录进行排序，找到最近输入的记录，这是下载员工的记录。如果工作正常，它应该只下载大约65000条记录，但无论何时发生，它都会下载每个员工记录。 MEETING END DATE字段是时间戳字段，指示输入记录的时间。有人建议我在其中构建一个子选择，但子查询不是我的强项，我很难找到正确的方法。代码在

之下

SELECT 
   AC.REG_NR, AC.DIS_NR, AC.GEMSID, AC.TMS_ID, AC.EMP_NA, AC.EMP_SEX_TYP_CD, 
   AC.EMP_EOC_GRP_TYP_CD, AC.DIV_NR, AC.CTR_NR, 
   AC.JOB_CLS_CD_DSC_TE, AC.JOB_GRP_CD, AC.Job_Function, AC.Job_Group, 
   AC.Meeting_Readiness_Rating, AC.Manager_Readiness_Rating, CD.Employee_ID, 
   CD.Meeting_Readiness_Rating AS Expr1, CD.Manager_Readiness_Rating AS Expr2, 
   CD.Meeting_End_Date, CD.EmployeeFeedback, 
   CD.DevelopmentForEmployee1, CD.DevelopmentForEmployee2, 
   CD.DevelopmentForEmployee3, CD.DevelopmentForEmployee4, 
   CD.DevelopmentForEmployee5, 
   CD.Justification, CD.Changed, CD.Notes
FROM  
   dbo.AC_Source AS AC 
LEFT OUTER JOIN
   (SELECT 
       EmployeeID AS Employee_ID, 
       MeetingReadinessLevel AS Meeting_Readiness_Rating, 
       ManagerReadinessLevel AS Manager_Readiness_Rating, 
       logdate AS Meeting_End_Date, EmployeeFeedback, 
       DevelopmentForEmployee1, DevelopmentForEmployee2, DevelopmentForEmployee3, 
       DevelopmentForEmployee4, DevelopmentForEmployee5, Justification, Changed, Notes
   FROM   
       dbo.AC_CDData_1

   UNION ALL

   SELECT 
       Employee_ID, Meeting_Readiness_Rating, Manager_Readiness_Rating, 
       Meeting_End_Date, '' AS EmployeeFeedback, '' AS DevelopmentForEmployee1, 
       '' AS DevelopmentForEmployee2, '' AS DevelopmentForEmployee3,
       '' AS DevelopmentForEmployee4, '' AS DevelopmentForEmployee5, 
       '' AS Justification,  '' AS Changed, '' AS Notes
   FROM  
       dbo.TMS_Data_Latest_Career_Meeting_Rating
   WHERE 
       (Plan_Year = '2013')) AS CD ON AC.TMS_ID = CD.Employee_ID

它基本上需要搜索员工ID并找到每个员工的最大会议结束日期

Answer 1

好的，

如果我已正确理解了这个问题，您应该能够通过使用RANK窗口功能来完成您尝试做的事情。我已经重写了相当多的查询以消除了很多选择标准，这些标准主要是关于你试图达到的核心逻辑的噪音：

SELECT Blah1
FROM  dbo.AC_Source AS AC 
INNER JOIN
(
    SELECT Blah2 FROM 
    (
        SELECT Blah2, ROW_NUMBER() OVER (PARTITION BY EmployeeID ORDER BY Meeting_End_Date DESC) AS RowNum
        FROM
        (
            SELECT Blah2
            FROM   dbo.AC_CDData_1
            UNION ALL
            SELECT Blah2
            FROM  dbo.TMS_Data_Latest_Career_Meeting_Rating
            WHERE (Plan_Year = '2013')
         ) AS InnerSelect
    ) AS CD
    WHERE RowNum = 1
)
ON AC.TMS_ID = CD.Employee_ID

所以这里发生的是，InnerSelect中的员工记录按EmployeeID分组，然后按分区中的Meeting_End_Date顺序排列。＆＃34; WHERE RowNum = 1＆＃34;内部选择之外的子句表示您只会在该分区的排名员工中获取排名第一的记录。

我可能没有完全正确的语法，因为在没有你的桌子的情况下进行测试有点困难（我现在没有时间制作它们），但这个想法应该适用于你想要完成的事情。

Answer 2

虽然它相当难看，但我担心表现会低于预期，但没有任何东西可以测试，这将是我最好的拍摄：

;WITH CD 
    AS (SELECT EmployeeID AS Employee_ID, MeetingReadinessLevel AS Meeting_Readiness_Rating, ManagerReadinessLevel AS Manager_Readiness_Rating, 
                                logdate AS Meeting_End_Date, EmployeeFeedback, DevelopmentForEmployee1, DevelopmentForEmployee2, DevelopmentForEmployee3, 
                                DevelopmentForEmployee4, DevelopmentForEmployee5, Justification, Changed, Notes
                FROM   dbo.AC_CDData_1

                UNION ALL
                SELECT Employee_ID, Meeting_Readiness_Rating, Manager_Readiness_Rating, Meeting_End_Date, '' AS EmployeeFeedback, '' AS DevelopmentForEmployee1, 
                                '' AS DevelopmentForEmployee2, '' AS DevelopmentForEmployee3, '' AS DevelopmentForEmployee4, '' AS DevelopmentForEmployee5, '' AS Justification, 
                                '' AS Changed, '' AS Notes
                FROM  dbo.TMS_Data_Latest_Career_Meeting_Rating
                WHERE (Plan_Year = '2013')
        ),
        MAXCD
    AS (SELECT Employee_ID, Last_Meeting_End_Date = MAX(Meeting_End_Date)
        FROM CD
        GROUP BY Employee_ID)

SELECT AC.REG_NR, AC.DIS_NR, AC.GEMSID, AC.TMS_ID, AC.EMP_NA, AC.EMP_SEX_TYP_CD, AC.EMP_EOC_GRP_TYP_CD, AC.DIV_NR, AC.CTR_NR, 
            AC.JOB_CLS_CD_DSC_TE, AC.JOB_GRP_CD, AC.Job_Function, AC.Job_Group, AC.Meeting_Readiness_Rating, AC.Manager_Readiness_Rating, CD.Employee_ID, 
            CD.Meeting_Readiness_Rating AS Expr1, CD.Manager_Readiness_Rating AS Expr2, CD.Meeting_End_Date, CD.EmployeeFeedback, 
            CD.DevelopmentForEmployee1, CD.DevelopmentForEmployee2, CD.DevelopmentForEmployee3, CD.DevelopmentForEmployee4, CD.DevelopmentForEmployee5, 
            CD.Justification, CD.Changed, CD.Notes
FROM  dbo.AC_Source AS AC 
    LEFT OUTER JOIN ( SELECT CD.* 
                        FROM CD
                        JOIN MAXCD 
                        ON MAXCD.Employee_ID = CD.Employee_ID
                        AND MAXCD.Last_Meeting_End_Date = CD.Meeting_End_Date ) FLTRD

                ON AC.TMS_ID = FLTRD.Employee_ID

选择以获取最新记录

2 个答案: