sql-server - 在 SQL Server 2012+ 中选择连续时间段的最小开始时间和最大结束时间

Question

我在 SQL Server 2012 中有一个表，其事件日志的格式如下:

+=====+=============================+=============================+======+
| ID1 |       start_time_utc        |        end_time_utc         | ID2  |
+=====+=============================+=============================+======+
|  57 | 2018-11-11 11:00:00.0000000 | 2018-11-11 11:00:28.0012900 |   15 |
|  57 | 2018-11-11 11:00:28.0012900 | 2018-11-11 11:01:29.0543947 | 1020 |
|  57 | 2018-11-11 11:01:29.0543947 | 2018-11-11 11:02:28.1923079 |   16 |
|  57 | 2018-11-11 11:02:28.1923079 | 2018-11-11 11:04:28.3367626 |   16 |
|  57 | 2018-11-11 11:04:28.3367626 | 2018-11-11 11:05:28.5307626 | 1020 |
| 103 | 2018-11-10 20:00:00.0000000 | 2018-11-11 03:00:00.0000000 |   15 |
| 103 | 2018-11-11 03:00:00.0000000 | 2018-11-11 10:57:00.8175737 |   15 |
| 103 | 2018-11-11 10:57:00.8175737 | 2018-11-11 10:57:27.8322749 | 1017 |
| 103 | 2018-11-11 10:57:27.8322749 | 2018-11-11 11:00:00.0000000 |   15 |
| 103 | 2018-11-11 11:00:00.0000000 | 2018-11-11 11:00:31.9916890 |   15 |
+-----+-----------------------------+-----------------------------+------+

对于给定的 ID1，结束日期与下一个事件的开始日期相匹配。我想通过匹配 ID1 和 ID2 列来对数据进行分区，并为连续事件的每个分区选择开始日期和结束日期。所以结果应该是:

+=====+=============================+=============================+======+
| ID1 |       start_time_utc        |        end_time_utc         | ID2  |
+=====+=============================+=============================+======+
|  57 | 2018-11-11 11:00:00.0000000 | 2018-11-11 11:00:28.0012900 |   15 |
|  57 | 2018-11-11 11:00:28.0012900 | 2018-11-11 11:01:29.0543947 | 1020 |
|  57 | 2018-11-11 11:01:29.0543947 | 2018-11-11 11:04:28.3367626 |   16 |
|  57 | 2018-11-11 11:04:28.3367626 | 2018-11-11 11:05:28.5307626 | 1020 |
| 103 | 2018-11-10 20:00:00.0000000 | 2018-11-11 10:57:00.8175737 |   15 |
| 103 | 2018-11-11 10:57:00.8175737 | 2018-11-11 10:57:27.8322749 | 1017 |
| 103 | 2018-11-11 10:57:27.8322749 | 2018-11-11 11:00:31.9916890 |   15 |
+-----+-----------------------------+-----------------------------+------+

我显然无法使用简单的分组依据，也不知道如何通过查询写入分区。感谢您的帮助。

Answer 1

这是一个更新版本，适用于给定的数据集，还可以处理在我测试过的所有情况下 id1、id2 序列大于 2 的情况。这比我原来的答案简单得多。将 tstGrouping 替换为您的表名称。

;with p as
(
  select
   ROW_NUMBER () over (order by id1, start_time_utc) as row_num,
   ROW_NUMBER () over (order by id1,id2, start_time_utc) as row_num2,
    *
  from
    tstgrouping x1
)
select 
  id1,
  min(start_time_utc) as start_time_utc,
  max(end_time_utc) as end_time_utc,
  id2
from p
  group by
row_num - row_num2,id1,id2
order by 
id1, start_time_utc