Question

我试图找出一种方法，可以在表格中的事件记录同时发生时识别出来。

例如，考虑我在Oracle Database ::

中有一个名为ProfileDefinition的表

EVENTS

我知道我可以通过这样的事情找到在给定日期范围内开始的所有事件::

|EVENT_UUID|HOST_NAME|START_TM|END_TM|

|1|host1|12-JUN-15 01.31.04.092000000 PM|12-JUN-15 01.55.58.716000000 PM|
|2|host2|15-JUN-15 10.02.45.494000000 AM|15-JUN-15 01.12.18.257000000 PM|
|3|host3|17-JUN-15 03.19.48.506000000 PM|17-JUN-15 03.51.59.874000000 PM|
|4|host4|18-JUN-15 09.24.36.602000000 PM|NULL|
|5|host5|18-JUN-15 12.32.43.109000000 PM|19-JUN-15 01.22.32.412000000 PM|

但这只能给我所有在该范围内开始的事件。

最终，我希望能够运行报告并检查以下内容，

＆＃34;一天中发生的并发事件数。＆＃34;
＆＃34;一小时内发生的并发事件数。＆＃34;

有没有人知道一种方法可以帮助我确定事件何时同时发生？

Answer 1

您可以使用相对简单的技术计算并发事件的数量：累积聚合。想法是计算启动和停止的次数。然后累计数是并发值的数量。

select tm, sum(isstart) as numstarts, sum(isstop) as numstops,
       (sum(sum(isstart)) over (order by tm nulls last) -
        sum(sum(isstop)) over (order by tm nulls last)
       ) as NumConcurrent
from ((select start_tm as tm, 1 as isstart, 0 as isstop from events
      ) union all
      (select stop_tm, 0 as isstart, 1 as isstop from events
      )
     ) e
group by tm;

这将为您提供数据中每次的并发事件数（开始时间或结束时间。然后，您可以使用where子句和{{1}提取一天或一小时的最大值} / order by或聚合。

Answer 2

我认为您需要将表连接到自身并获取2个事件范围内的所有事件：

event1.start between event2.start and event2.end 
OR
event1.end   between event2.start and event2.end 
OR
event1.start < event2.start and event1 > event2.end
AND CHECK THAT
event.end can be null

to filter the data - see `where` in query below
to count number of events - use count(*) over ()

测试数据

insert into events(EVENT_UUID,HOST_NAME,START_TM,END_TM)
  values (1,'host1',to_date('12-JUN-15 01.31.04','dd-mon-yy hh24.mi.ss'),to_date('12-JUN-15 01.55.58','dd-mon-yy hh24.mi.ss'))

insert into events(EVENT_UUID,HOST_NAME,START_TM,END_TM)
  values (2,'host2',to_date('15-JUN-15 10.02.45','dd-mon-yy hh24.mi.ss'),to_date('15-JUN-15 11.12.18','dd-mon-yy hh24.mi.ss'));

insert into events(EVENT_UUID,HOST_NAME,START_TM,END_TM)
  values (3,'host3',to_date('17-JUN-15 03.19.48','dd-mon-yy hh24.mi.ss'),to_date('17-JUN-15 03.51.59','dd-mon-yy hh24.mi.ss'));

insert into events(EVENT_UUID,HOST_NAME,START_TM,END_TM)
  values (4,'host4',to_date('18-JUN-15 09.24.36','dd-mon-yy hh24.mi.ss'),null);

insert into events(EVENT_UUID,HOST_NAME,START_TM,END_TM)
  values (5,'host5',to_date('18-JUN-15 12.32.43','dd-mon-yy hh24.mi.ss'),to_date('19-JUN-15 01.22.32','dd-mon-yy hh24.mi.ss'));

insert into events(EVENT_UUID,HOST_NAME,START_TM,END_TM)
  values (6,'host6',to_date('18-JUN-15 12.45.43','dd-mon-yy hh24.mi.ss'),to_date('19-JUN-15 01.01.32','dd-mon-yy hh24.mi.ss'));

insert into events(EVENT_UUID,HOST_NAME,START_TM,END_TM)
  values (7,'host7',to_date('12-JUN-15 01.32.04','dd-mon-yy hh24.mi.ss'),to_date('12-JUN-15 02.55.58','dd-mon-yy hh24.mi.ss'))

查询：

select ev1.event_uuid, ev2.event_uuid
     , ev1.start_tm, ev1.end_tm
     , ev2.start_tm, ev2.end_tm
     ,count(*) over () as total_count
 from events ev1
  inner join events ev2
    on ((ev1.start_tm between ev2.start_tm and nvl(ev2.end_tm, sysdate))
     or (nvl(ev1.end_tm,sysdate) between ev2.start_tm and nvl(ev2.end_tm, sysdate))
     or (ev2.start_tm < ev1.start_tm and nvl(ev1.end_tm,sysdate) < nvl(ev1.end_tm, sysdate)))
        and ev1.event_uuid != ev2.event_uuid
  where to_date('18.06.2015 13', 'dd.mm.yyyy hh24') between  ev1.start_tm and nvl(ev1.end_tm,sysdate)
order by 3,4   

    EVENT_UUID  EVENT_UUID  START_TM    END_TM  START_TM    END_TM  TOTAL_COUNT
1   5   4   18/06/2015 12:32:43 19/06/2015 01:22:32 18/06/2015 09:24:36     3
2   6   5   18/06/2015 12:45:43 19/06/2015 01:01:32 18/06/2015 12:32:43 19/06/2015 01:22:32 3
3   6   4   18/06/2015 12:45:43 19/06/2015 01:01:32 18/06/2015 09:24:36     3

Answer 3

使用类似于以下内容的谓词：

where start_tm <= TO_DATE('2015-JUN-13 23:59:59', 'YYYY-MON-DD HH24:MI:SS')
  and (end_tm is null or TO_DATE('2015-JUN-11 00:00:00', 'YYYY-MON-DD HH24:MI:SS') <= end_tm)

这将收集在报告期结束前开始并在报告期开始后结束的所有活动。

它不会接收在报告期开始之前结束或在报告期结束后开始的活动。

Oracle SQL - 计算并发事件数

3 个答案: