Question

我有一个视图，在我们的外联网中填充表单。我们只想查看每组物质编号的最新数据。

在下面的图片中，我们不希望看到任何事件发生在RED的位置，因为它们是旧事件。我们确实希望保留左侧的数据。

我在表格中突出显示的行是应该在Extranet表单中显示的行。

每一行都是不同的物质编号。

这是为了提取数据而创建的视图。

我无法弄清楚如何只显示最新的事件。任何帮助将不胜感激。

SELECT e.eventsno        AS DocketID, 
 M1.mattercode, 
 M1.clientid, 
 M1.matterid,
 M1.AreaofLaw,
 DocketCode, 
 e.eventdate         AS StartDate, 
 e.enddate,
 et.eventdesc, 
 Cast(e.notes AS VARCHAR(4096)) AS Summary 
FROM   dbo.events AS e 
 INNER JOIN dbo.eventmatters AS em 
         ON em.events = e.events 
 INNER JOIN dbo.matters AS m 
         ON m.matters = em.matters 
 INNER JOIN dbo.eventtypes AS et 
         ON et.eventtypes = e.eventtypes 
 RIGHT OUTER JOIN dbo.vu_lp2_matters AS M1 
               ON M1.mattercode = m.matterid 
 WHERE   e.eventkind = 'D' 
 AND   e.eventtypes IN (SELECT eventtypes 
                        FROM   dbo.events 
                        WHERE  ( et.eventdesc <> 'Accounts Receivable' 
                                  OR et.eventdesc NOT LIKE 'Reminder%' ) 
     ) 
 AND ( e.eventdate >= CONVERT(DATETIME, '2014-01-01 00:00:00', 102))

Answer 1

感谢您的帮助。我最终使用CTE来正确显示数据。以下是完成的脚本。

 With cte As 
 (Select e.EventsNo, 
    m1.MatterCode,
    m1.ClientID,
    m1.MatterID,
    m1.AreaOfLaw,
    e.EventTypes    AS DocketCode, 
    e.EventDate,
    e.EndDate, 
    et.DocketDesc ,
    Cast(e.notes AS VARCHAR(4096)) Summary ,
    Row_Number() Over(Partition By MatterCode Order By EventDate Desc) AS rnLastOverAll,
    Row_Number() Over(Partition By MatterCode, DocketDesc Order By EventDate Desc) As rnLastByDocDesc
 FROM   dbo.events e 
 INNER JOIN dbo.eventmatters em ON em.events = e.events
 INNER JOIN dbo.matters m ON m.matters = em.matters 
 INNER JOIN dbo.vu_LP2_DocketCodes et ON et.DocketCode = e.eventtypes 
 RIGHT OUTER JOIN dbo.vu_lp2_matters M1 ON M1.mattercode = m.matterid 
 WHERE e.eventkind = 'D'
 )

 Select c2.EventsNo 'DocketID',c2.MatterCode,c2.ClientID,c2.MatterID, c2.AreaOfLaw,
 c2.DocketCode, c2.EventDate 'StartDate', c2.EndDate, c2.DocketDesc, c2.Summary
 From cte c1
 Inner Join cte c2 On c1.MatterCode = c2.MatterCode And c2.rnLastByDocDesc = 1  
 And (
  (c1.DocketDesc = 'Demand' And c2.DocketDesc In ('Demand'))
  Or (c1.DocketDesc = 'Complaint' And c2.DocketDesc In ('Demand', 'Complaint'))
  Or (c1.DocketDesc = 'Pre-Trial' And c2.DocketDesc In ('Demand', 'Complaint', 'Pre-Trial'))
  Or (c1.DocketDesc = 'Post Judgment' And c2.DocketDesc In ('Demand', 'Complaint', 'Pre-Trial', 'Post Judgment'))
  Or (c1.DocketDesc = 'Stop Collections' And c2.DocketDesc In ('Demand', 'Complaint', 'Pre-Trial', 'Post Judgment', 'Stop Collections'))
) Where c1.rnLastOverAll = 1

Answer 2

您可以使用ROW_NUMBER/RANK获取每个组的第一个值：

WITH cte AS (
  SELECT
    ROW_NUMBER() OVER(PARTITION BY M1.mattercode ORDER BY e.eventdate DESC) AS rn
    -- your complex query
)
SELECT *
FROM cte
WHERE rn = 1;

Answer 3

对查询使用ROW_NUMBER函数，按事件日期降序排序分区并过滤具有row_number = 1的记录：

SELECT * from (
  SELECT e.eventsno        AS DocketID, 
     M1.mattercode, 
     M1.clientid, 
     M1.matterid,
     M1.AreaofLaw,
     DocketCode, 
     e.eventdate         AS StartDate, 
     e.enddate,
     et.eventdesc, 
     Cast(e.notes AS VARCHAR(4096)) AS Summary ,
ROW_NUMBER () OVER (PARTITION BY M1.mattercode order by e.eventdate desc) as row_no
    FROM   dbo.events AS e 
     INNER JOIN dbo.eventmatters AS em 
             ON em.events = e.events 
     INNER JOIN dbo.matters AS m 
             ON m.matters = em.matters 
     INNER JOIN dbo.eventtypes AS et 
             ON et.eventtypes = e.eventtypes 
     RIGHT OUTER JOIN dbo.vu_lp2_matters AS M1 
                   ON M1.mattercode = m.matterid 
     WHERE   e.eventkind = 'D' 
     AND   e.eventtypes IN (SELECT eventtypes 
                            FROM   dbo.events 
                            WHERE  ( et.eventdesc <> 'Accounts Receivable' 
                                      OR et.eventdesc NOT LIKE 'Reminder%' ) 
         ) 
     AND ( e.eventdate >= CONVERT(DATETIME, '2014-01-01 00:00:00', 102))
) TMP where row_no=1

如何获取每个事项ID的最新记录列表？

3 个答案: