Re: need to join successive log entries into one

>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<

On 3/14/01, 5:24:12 PM, George Young <gry(at)ll(dot)mit(dot)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