f不具有相同时间戳的报警扫描行。表示在扫描期间未找到报警。我添加了每个请求的Ev_消息列的重要性。结果表明我使用的是SQL Server 2012。我正在使用SQL Server Reporting Services通过Microsoft Visual S

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f不具有相同时间戳的报警扫描行。表示在扫描期间未找到报警。我添加了每个请求的Ev_消息列的重要性。结果表明我使用的是SQL Server 2012。我正在使用SQL Server Reporting Services通过Microsoft Visual Studio 2010进行查询。我一字不差地抄写了你的答案，它给了我想要的。我错了。您未能考虑第一列Ev_消息。此列包含一个机器ID，可用于区分不同机器的报警。你不喜欢任意的列名吗？您的查询不会查看该列。我看看我能不能自己看一下。@TylerLillemo请更新你原来的帖子，以反映EV_消息的重要性，因为这是你第一次提到它。谢谢你，我相信我能够通过在第一次内部连接和组之间添加WHERE语句来修复它by@TylerLillemo您还需要更新窗口调用窗体通过Alarm.Ev_消息进行分区，通过Alarm.Ev_Custom1，Alarm.Ev_消息进行分区。我已经更新了我的答案以反映这一变化。谢谢你的回答。它也能起作用。我不得不在第一个内部连接和组之间添加一个WHERE语句，类似于@EdmondQuinton的帖子。我很抱歉没有说清楚我需要它。出于某种原因，我收到了两条不同的警报线，持续时间超过一天@EdmondQuinton的解决方案没有这个问题，我无法复制。根据您的样本数据，如果我将最终警报从2016年5月23日上午11:02:00更改为2016年5月24日上午11:02:00，它似乎仍然可以正常工作。如果您有其他数据，我可以看一看，但听起来您已经有了一个有效的解决方案。

;WITH AlarmTimeBuckets
AS 
(
    SELECT       EventStart.Ev_Comment AS StartDateTime 
                ,MIN(COALESCE (EventEnd.Ev_Comment, EventStart.Ev_Comment)) AS EndDateTime
                ,EventStart.Ev_Message As Machine
    FROM         A EventStart 
    INNER JOIN   A EventEnd ON EventStart.Ev_Comment < EventEnd.Ev_Comment AND EventStart.Ev_Custom1 = 'Alarms Scanned' AND EventEnd.Ev_Custom1 = 'Alarms Scanned' AND EventStart.Ev_Message = EventEnd.Ev_Message
    GROUP BY     EventStart.Ev_Message, EventStart.Ev_Comment
),
AlarmsByTimeBucket
AS
(
    SELECT      AlarmTimeBuckets.Machine
               ,AlarmTimeBuckets.StartDateTime
               ,AlarmTimeBuckets.EndDateTime 
               ,Alarm.Ev_Custom1 AS Alarm
               ,(
                 CASE
                    WHEN LAG(AlarmTimeBuckets.EndDateTime, 1, NULL) OVER (PARTITION BY Alarm.Ev_Custom1,Alarm.Ev_Message ORDER BY AlarmTimeBuckets.StartDateTime) = AlarmTimeBuckets.StartDateTime THEN 0
                    ELSE 1
                 END
                ) AS IsNewEvent
    FROM       A Alarm 
    INNER JOIN AlarmTimeBuckets  ON Alarm.Ev_Message = AlarmTimeBuckets.Machine AND  Alarm.Ev_Comment = AlarmTimeBuckets.StartDateTime
    WHERE     (Alarm.Ev_Custom1 <> 'Alarms Scanned')
)
,
AlarmsByGroupingID
AS
(
    SELECT   Machine
            ,StartDateTime
            ,EndDateTime
            ,Alarm
            ,SUM(IsNewEvent) OVER (ORDER BY Machine, Alarm, StartDateTime) AS GroupingID
    FROM    AlarmsByTimeBucket
)
SELECT       MAX(Machine) AS Machine
            ,MIN(StartDateTime) AS StartDateTime
            ,MAX(EndDateTime) AS EndDateTime
            ,MAX(Alarm) AS Alarm
FROM        AlarmsByGroupingID
GROUP BY    GroupingID
ORDER BY    StartDateTime

WITH T AS (SELECT  s.Ev_Comment AS start_time, MIN(COALESCE (e.Ev_Comment, s.Ev_Comment)) AS end_time           
           FROM A AS s 
           INNER JOIN A AS e 
           ON s.Ev_Comment < e.Ev_Comment 
           AND s.Ev_Custom1 = 'Alarms Scanned' 
           AND e.Ev_Custom1 = 'Alarms Scanned'
           GROUP BY s.Ev_Comment
          ),

T2 AS(SELECT T_1.start_time, T_1.end_time, A.Ev_Custom1,
             ROW_NUMBER() OVER (PARTITION BY EV_CUSTOM1 ORDER BY T_1.START_TIME) RN
      FROM  A 
      INNER JOIN
      T AS T_1 
      ON A.Ev_Comment LIKE T_1.start_time
      WHERE (A.Ev_Custom1 <> 'Alarms Scanned')
      )

select 
  coalesce(b.START_TIME, a.START_TIME) START_TIME, 
  max(a.END_TIME) END_TIME, 
  a.EV_CUSTOM1
from T2 a
left outer join T2 b
on a.EV_CUSTOM1 = b.EV_CUSTOM1
and a.START_TIME = b.END_TIME
and a.RN = b.RN+1
group by coalesce(b.START_TIME, a.START_TIME), 
         a.EV_CUSTOM1