1

电流输出

Activity            FromTime                ToTime
-------------------------------------------------------------------
STOPPED INSIDE POI  2012-11-14 01:08:46.000 2012-11-14 01:19:46.000
MOVING INSIDE POI   2012-11-14 01:20:46.000 2012-11-14 01:21:46.000
MOVING OUTSIDE POI  2012-11-14 01:22:46.000 2012-11-14 01:22:46.000
STOPPED OUTSIDE POI 2012-11-14 01:23:46.000 2012-11-14 01:23:46.000
MOVING OUTSIDE POI  2012-11-14 01:24:46.000 2012-11-14 01:25:46.000

预期产出

Activity            FromTime                ToTime
-------------------------------------------------------------------
STOPPED INSIDE POI  2012-11-14 01:08:46.000 2012-11-14 01:20:46.000
MOVING INSIDE POI   2012-11-14 01:20:46.000 2012-11-14 01:22:46.000
MOVING OUTSIDE POI  2012-11-14 01:22:46.000 2012-11-14 01:23:46.000
STOPPED OUTSIDE POI 2012-11-14 01:23:46.000 2012-11-14 01:24:46.000
MOVING OUTSIDE POI  2012-11-14 01:24:46.000 2012-11-14 01:25:46.000

有什么简单的方法吗？

4

2 回答 2

1 
;with a as
(
select Activity, FromTime, ToTime, 
row_number() over (order by FromTime) rn from <yourtable>
)
select a.Activity, a.FromTime, coalesce(b.FromTime, a.ToTime) ToTime
from a left join a b on a.rn = b.rn - 1
order by a.rn
于 2012-12-06T15:46:44.457 回答
1

这应该适合你：

UPDATE table1
SET ToTime = join_table.newToTime
FROM (
  SELECT t2.FromTime target, MIN(t1.FromTime) newToTime 
  FROM table1 t1 
  JOIN table1 t2 ON t1.FromTime > t2.FromTime
  GROUP BY t2.FromTime) join_table
WHERE FromTime = join_table.target

基本上，您正在寻找FromTime大于当前行的最小值 - 并将其用作ToTime. 请注意，不会更新最后一行，因为不会FromTime找到匹配的更大的行。

于 2012-12-06T15:42:50.777 回答