我有一组记录,用于跟踪系统的可用性。示例数据:
System_ID Event DateOfEvent
1 Down 2010-05-01 13:20:10
1 Up 2010-05-01 13:25:19
1 Down 2010-05-05 10:12:12
1 Up 2010-05-06 14:10:16
2 Down 2010-05-05 20:22:22
2 Up 2010-05-06 23:20:26
如何将这些数据转换为以下布局?
System_Id DowntimeStart DowntimeInSeconds
1 2010-05-01 13:20:10 309
1 2010-05-05 10:12:12 100684
2 2010-05-05 20:22:22 97084