T sql查询。确定日期列中的开始日期/结束日期

-2

我需要您的帮助。我使用sql server 2012. 此查询是针对日志应用程序的。我有一个这样的表格：T sql查询。确定日期列中的开始日期/结束日期

这是一个带有2个请求标识符的示例，这里是我想要获得的结果。

我已经完成了整个周末，仍然没有找到解决方案。我尝试了SQL Server 2012的滞后和引导功能，但它不起作用。

IF OBJECT_ID('tempdb..#test', 'U') IS NOT NULL 
DROP TABLE #test; 

CREATE TABLE #test 
(
    requestid INT, 
    eventdate DATETIME, 
    eventname VARCHAR(20) 
); 

INSERT #test 
(
    requestid, 
    eventdate, 
    eventname 
) 
VALUES 
(46444, '2016/08/08 10:20:33.000', 'OPENED'), 
(46444, '2016/08/08 10:33:10.000', 'REVIEWED'), 
(46444, '2016/08/08 11:09:55.000', 'OPENED'), 
(46444, '2016/08/08 11:32:41.000', 'REVIEWED'), 
(46444, '2016/08/08 11:39:01.000', 'CLOSED'), 
(46444, '2016/08/08 15:00:04.000', 'OPENED'), 
(46444, '2016/08/08 15:17:40.000', 'REVIEWED'), 
(46444, '2016/08/08 15:29:36.000', 'OPENED'), 
(46444, '2016/08/08 15:31:34.000', 'REVIEWED'), 
(46444, '2016/08/08 15:36:37.000', 'CLOSED'), 
(46444, '2016/08/08 17:04:27.000', 'OPENED'), 
(46445, '2016/08/10 09:00:00.000', 'OPENED'), 
(46445, '2016/08/11 01:33:10.000', 'REVIEWED'), 
(46445, '2016/08/12 15:36:37.000', 'CLOSED'); 

select * 
from #test

结果

requestid eventdate   eventname CLOSEDDate  CLOSEDEventname 
46444 2016-08-08 10:33:10.000 REVIEWED 2016-08-08 11:39:01.000 CLOSED 
46444 2016-08-08 15:17:40.000 REVIEWED 2016-08-08 15:36:37.000 CLOSED 
46445 2016-08-11 01:33:10.000 REVIEWED 2016-08-12 15:36:37.000 CLOSED

来源

2016-12-04 Lidou123

请编辑您的问题并提供列的逻辑。 –

我可以看到你仿佛想。对于每个关闭日期，您需要最近的关闭日期。您可以通过只枚举关闭指定一个组，然后汇总为此在：

select requestid, 
     min(case when eventname = 'REVIEWED' then eventdate end) as eventdate, 
     'REVIEWED' as event, 
     max(eventdate) as closedate, 
     'CLOSED' as closedeventname 
from (select t.*, 
      sum(case when eventname = 'CLOSED' then 1 else 0 end) over (partition by requestid order by eventdate desc) as grp 
     from #test t 
    ) t 
group by requestid, grp; 
Having min(case when eventname = 'REVIEWED' then eventdate end) is not null

我敢肯定，这会产生你想要的输出。如果您未能在问题中指定您需要的其他规则，我会强烈建议您询问另一个问题并提供更好的解释。

来源

2016-12-04 17:27:30

Yeees !!!!!正是我想要的。非常感谢John和Gordon – Lidou123

T sql查询。确定日期列中的开始日期/结束日期

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