Re: need to join successive log entries into one
От | George Young |
---|---|
Тема | Re: need to join successive log entries into one |
Дата | |
Msg-id | 01031417344206.02477@pen обсуждение исходный текст |
Ответ на | Re: need to join successive log entries into one (Richard H <dev@archonet.com>) |
Список | pgsql-sql |
On Wed, 14 Mar 2001, you wrote: > On 3/14/01, 5:24:12 PM, George Young <gry@ll.mit.edu> wrote regarding [SQL] > I need to join successive log entries into one: > > I have a table like: > > > run | seq | start | done > > 1415| 261| 2001-01-29 12:36:55| 2001-02-07 13:02:38 > > 1415| 263| 2001-02-14 07:40:04| 2001-02-15 16:05:04 > > 1415| 264| 2001-02-16 16:05:05| 2001-03-08 16:34:03 > > 1415| 265| 2001-03-08 16:34:04| > > > This is a log of some operations done on some runs. 'seq' is the step > > within the run. > > > I need to produce a new table that coalesces immediately successive > > operations on a run into one, e.g.: > > > run | start | done > > 1415| 2001-01-29 12:36:55| 2001-02-07 13:02:38 > > 1415| 2001-02-14 07:40:04| > > 1747| 2001-02-15 09:14:39| 2001-03-01 09:02:39 > > 1747| 2001-03-05 13:13:58| > > 1954| 2001-02-02 20:55:39| 2001-03-02 10:17:15 > > Try: > > select run,min(start),max(done) from mytable group by run; Alas, this combines *all* entries for a given run, not just those that are imediately adjacent (in time, or by 'seq' number)... -- George Young, Rm. L-204 gry@ll.mit.edu MIT Lincoln Laboratory 244 Wood St. Lexington, Massachusetts 02420-9108 (781) 981-2756
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