将下一行的开始时间更新为上一行的结束日期

Question

我有一张桌子：

locid   timestart      timeend
1       Jan 23 2015    Dec-31-9999
1       Feb 15 2015    Dec-31-9999
2       Mar 18 2015    Apr-28-2015
2       Nov 23 2015    Dec-31-9999
2       Jul 23 2015    Nov-23-2015
2       Apr 28 2015    Dec-31-9999

上表中的时间结束不正确。它应该像下面的

locid   timestart      timeend
1       Jan 23 2015    feb-15-2015
1       Feb 15 2015    Dec-31-9999
2       Mar 18 2015    Apr-28-2015
2       Nov 23 2015    Jul-23-2015
2       Jul 23 2015    Nov-23-2015
2       Apr 28 2015    Dec-31-2015

如何编写SQL来纠正表1中的时间结束，如表2所示？

Answer 1

您想要下一行的timestart：

WITH newTable AS
(SELECT 8, LEAD(timestart,1,'99991231') OVER (PARTITON BY locid ORDER BY timestart) AS newTimeEnd
FROM theTable
)
UPDATE newTable SET timeend = newTimeEnd;