Question

我是SQL Server的新手，我不知道如何说出这个问题。我觉得这可能会重演。如果您知道，请将其标记为重复。我将用数据解释我想要实现的目标

表格数据 - sometable

ID  TKID    Status    DateTimeStamp            RunMin
-----------------------------------------------------
215  6      Start   2009-10-29 09:48:14.243    NULL
261  6      Stop    2009-10-30 10:05:16.460    1457
356  6      Start   2009-11-03 14:11:05.097    NULL
357  6      Stop    2009-11-03 15:20:05.133    1526
358  6      Start   2009-11-03 16:14:45.863    NULL
574  19     Start   2009-11-12 13:12:11.827    NULL
575  19     Stop    2009-11-12 13:47:23.077    35
543 259     Start   2009-11-12 09:01:24.013    NULL 
620 259     Stop    2009-11-14 11:25:30.177    NULL 
623 259     Start   2009-11-14 16:47:32.913    NULL 
720 352     Start   2009-11-18 17:47:38.637    NULL 
730 352     Stop    2009-11-19 08:22:28.317    874  
773 352     Start   2009-11-20 10:00:11.320    NULL 
778 352     Stop    2009-11-20 11:51:59.853    985  
812 352     Start   2009-11-20 17:51:35.640    NULL 
813 352     Stop    2009-11-20 17:53:52.373    987  
822 352     Start   2009-11-23 08:13:23.030    NULL 
823 352     Stop    2009-11-23 08:17:33.063    991  
901 352     Start   2009-12-01 10:50:16.547    NULL 
910 352     Stop    2009-12-01 10:50:54.200    991

预期产出：

ID  TKID    Status    DateTimeStamp            RunMin      
-----------------------------------------------------
358  6      Start   2009-11-03 16:14:45.863    NULL     
623 259     Start   2009-11-14 16:47:32.913    NULL

所以基本上我想获得具有start状态但没有stop状态的记录。

现在我尝试了什么..

我尝试使用ROW_NUMBER功能，如下所示

;with cte as 
(
    select 
       *,
       ROW_NUMBER() OVER (PARTITION BY tkid 
                          ORDER BY tkid, DateTimeStamp) AS rn
    from Prog_Timer
)
SELECT * 
FROM 
   (SELECT * 
    FROM cte
    WHERE TkID IN (SELECT TkID
                   FROM cte 
                   GROUP BY TkID
                   HAVING COUNT(*)% 2 = 1)
) as d

它给我结果

然后尝试使用Odd计数得到tkid，并且tkid得到了数据。

ID  TKID    Status    DateTimeStamp            RunMin
-----------------------------------------------------
215  6      Start   2009-10-29 09:48:14.243    NULL
261  6      Stop    2009-10-30 10:05:16.460    1457
356  6      Start   2009-11-03 14:11:05.097    NULL
357  6      Stop    2009-11-03 15:20:05.133    1526
358  6      Start   2009-11-03 16:14:45.863    NULL
543 259     Start   2009-11-12 09:01:24.013    NULL 
620 259     Stop    2009-11-14 11:25:30.177    NULL 
623 259     Start   2009-11-14 16:47:32.913    NULL

我不知道如何从每个tkid的此输出中获取最后一行仅选择最后一个开始行。我认为我的approch非常复杂。必须有简单的方法来获得我想要的东西。如果您有新方法，请随时发布。如果您有任何要添加到我现有查询的内容，请随时发布。如果有困惑，请随时发表评论。

Answer 1

如果您将ROW_NUMBER() PARTITION修改为order by DateTimeStamp desc，则每个tkid的最新行将被rn=1，从而为您提供每个tkid的最新状态}}。然后，您只需SELECT行rn = 1和Status = 'Start'即可获得所需的输出：

select * from
(select 
   *,
   ROW_NUMBER() OVER (PARTITION BY tkid order by DateTimeStamp desc) as rn
from Prog_Timer
)
T
where 
T.rn = 1 -- the latest status for each tkid 
and T.Status = 'Start' -- returns only started and not stopped timers
-- if timer is stopped, t.Status will be 'Stop' in the latest row

Answer 2

很多方法可以做到这一点，其中一个方法如下：

SELECT T.*
FROM SOMETABLE T
JOIN (SELECT MAX(DATETIMESTAMP) MAXTIME, TKID
    FROM SOMETABLE 
    GROUP BY TKID) SRC
        ON SRC.MAXTIME = T.DATETIMESTAMP AND SRC.TKID = T.TKID
WHERE T.STATUS = 'Start'

根据实际数据，您可能希望获得MAX（ID），以防有时可以让进程停止并同时启动。但是，当然，如果更新，旧ID值可能会有更新的时间戳。

Answer 3

我认为这可以显示您的结果：

select *
from Prog_Timer st
where st.[Status] = 'Start' And
    isnull((select min(sti.DateTimeStamp) from Prog_Timer sti  
            where sti.[Status] = 'Stop' And sti.TKId = st.TKId And sti.DateTimeStamp > st.DateTimeStamp )
        , cast('2999/12/29' as datetime)) 
    > 
    isnull((select min(stii.LogDateTime) from Prog_Timer stii 
            where stii.[Status] = 'Start' And stii.TKId = st.TKId And stii.DateTimeStamp > st.DateTimeStamp)
        , cast('2999/12/29' as datetime))

但我等着最好的答案;）。

Answer 4

怎么样：

;with cte as 
(
    select *
         , MAX(DateTimeStamp) OVER (PARTITION BY tkid) AS maxDt
    from Prog_Timer
)
SELECT * 
FROM cte
WHERE DateTimeStamp=maxDt and Status='Start'

Answer 5

尝试此查询：

SELECT * 
FROM tableName 
WHERE Status = 'start' 
  AND ID NOT IN (SELECT ID 
                 FROM tableName 
                 WHERE Status = 'stop')

如何在SQL Server中使用row_number获取匹配的数据？

5 个答案: