>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<
On 3/14/01, 5:24:12 PM, George Young <gry@ll.mit.edu> wrote regarding [SQL]
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;
- Richard Huxton
