这是我的源表
Reference ModifiedDate Teachers Students SchoolID ETC
-------------------------------------------------------------------------
1023175 2017-03-03 16:02:01.723 10 25 5
1023175 2017-03-07 07:59:49.283 15 50 15
1023175 2017-03-12 11:14:40.230 25 6 5
1023176 2017-03-04 16:02:01.723 11 35 8
1023176 2017-03-08 07:59:49.283 16 60 25
1023177 2017-03-15 11:14:40.230 15 7 2
我需要以下输出
Reference StartDate EndDate
---------------------------------------------
1023175 2017-03-03 16:02:01.723 2017-03-07 07:59:49.283
1023175 2017-03-07 07:59:49.283 2017-03-12 11:14:40.230
1023175 2017-03-12 11:14:40.230 9999-12-31 00:00:00.000
1023176 2017-03-04 16:02:01.723 2017-03-08 07:59:49.283
1023176 2017-03-08 07:59:49.283 9999-12-31 00:00:00.000
1023177 2017-03-15 11:14:40.230 9999-12-31 00:00:00.000 (last record should have this value)
教师学生学校ID
10 25 5
15 50 15
25 6 5
11 35 8
16 60 25
15 7 2
教师,学生和SchoolId等所有其他专栏也必须与每条记录一起出现在输出中。
有关如何实现这一目标的任何建议? 使用Sql Server 2008
答案 0 :(得分:2)
select
Reference
, StartDate = t.ModifiedDate
, EndDate = coalesce(x.ModifiedDate, convert(datetime,'9999-12-31 00:00:00.000'))
, Teachers
, Students
, SchoolID
from t
outer apply (
select top 1 i.ModifiedDate
from t as i
where i.Reference = t.Reference
and i.ModifiedDate > t.ModifiedDate
order by i.ModifiedDate asc
) x
rextester演示:http://rextester.com/RFTD32624
返回:
+-----------+-------------------------+-------------------------+----------+----------+----------+
| Reference | StartDate | EndDate | Teachers | Students | SchoolID |
+-----------+-------------------------+-------------------------+----------+----------+----------+
| 1023175 | 2017-03-03 16:02:01.723 | 2017-03-07 07:59:49.283 | 10 | 25 | 5 |
| 1023175 | 2017-03-07 07:59:49.283 | 2017-03-12 11:14:40.230 | 15 | 50 | 15 |
| 1023175 | 2017-03-12 11:14:40.230 | 9999-12-31 00:00:00.000 | 25 | 6 | 5 |
| 1023176 | 2017-03-04 16:02:01.723 | 2017-03-08 07:59:49.283 | 11 | 35 | 8 |
| 1023176 | 2017-03-08 07:59:49.283 | 9999-12-31 00:00:00.000 | 16 | 60 | 25 |
| 1023177 | 2017-03-15 11:14:40.230 | 9999-12-31 00:00:00.000 | 15 | 7 | 2 |
+-----------+-------------------------+-------------------------+----------+----------+----------+
参考: