Question

我有一个SQL Server 2005表，记录了流程的每个步骤，如下所示

ResourceID    EventType         Time
ABC123        Job Activated     2013-01-08 10:01:31.000
ABC123        Download Complete 2013-01-08 10:03:32.000
ABC123        Job Complete      2013-01-08 10:07:42.000
XYZ789        Job Activated     2013-01-08 12:05:11.000
XYZ789        Download Complete 2013-01-08 12:08:52.000
XYZ789        Job Complete      2013-01-08 12:14:21.000

我想要做的是显示每个ResourceID一行的结果，显示每个事件的时间。

ResourceID  Job Activated             Download Complete        Job Complete
ABC123      2013-01-08 10:01:31.000   2013-01-08 10:03:32.000  2013-01-08 10:07:42.000
XYZ789      2013-01-08 12:05:11.000   2013-01-08 12:08:52.000  2013-01-08 12:14:21.000

有关如何完成此任务的任何建议？感谢。

Answer 1

正如评论建议的那样，您可以使用PIVOT轻松完成此操作：

DECLARE @x TABLE(ResourceID CHAR(6), EventType VARCHAR(32), [Time] DATETIME);

INSERT @x SELECT 'ABC123','Job Activated    ','2013-01-08 10:01:31.000'
UNION ALL SELECT 'ABC123','Download Complete','2013-01-08 10:03:32.000'
UNION ALL SELECT 'ABC123','Job Complete     ','2013-01-08 10:07:42.000'
UNION ALL SELECT 'XYZ789','Job Activated    ','2013-01-08 12:05:11.000'
UNION ALL SELECT 'XYZ789','Download Complete','2013-01-08 12:08:52.000'
UNION ALL SELECT 'XYZ789','Job Complete     ','2013-01-08 12:14:21.000';

SELECT ResourceID,[Job Activated],[Download Complete],[Job Complete]
FROM @x
PIVOT 
(
   MAX([Time]) FOR EventType IN (
    [Job Activated],[Download Complete],[Job Complete]
)) AS p;

Answer 2

您可以使用带有CASE表达式的聚合函数来旋转数据：

select resourceid,
  max(case when EventType = 'Job Activated' then [time] end) as [Job Activated],
  max(case when EventType = 'Download Complete' then [time] end) as [Download Complete],
  max(case when EventType = 'Job Complete' then [time] end) as [Job Complete]
from yourtable
group by resourceid

请参阅SQL Fiddle with Demo。

或者您可以在桌面上使用多个联接：

select ja.resourceid,
  ja.[time] as [Job Activated],
  dc.[time] as [Download Complete],
  jc.[time]  as [Job Complete]
from yourtable ja
left join yourtable dc
  on ja.resourceid = dc.resourceid
  and dc.EventType = 'Download Complete'
left join yourtable jc
  on ja.resourceid = jc.resourceid
  and jc.EventType = 'Job Complete'
where ja.EventType = 'Job Activated'

请参阅SQL Fiddle with Demo

将多个记录合并为一行

2 个答案: