| From: | "Richard Broersma" <richard(dot)broersma(at)gmail(dot)com> |
|---|---|
| To: | "ries van Twisk" <pg(at)rvt(dot)dds(dot)nl> |
| Cc: | "Mark Morgan Lloyd" <markMLl(dot)pgsql-general(at)telemetry(dot)co(dot)uk>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Numbering rows |
| Date: | 2008-10-15 19:23:42 |
| Message-ID: | 396486430810151223y72d5c784yf174ea468ede639a@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
On Wed, Oct 15, 2008 at 12:08 PM, ries van Twisk <pg(at)rvt(dot)dds(dot)nl> wrote:
> May be this function can help :
>
> http://www.postgresql.org/docs/8.3/static/functions-srf.html
Using generate series won't number the rows that way that you would
want. You basically will end up with a cross join between the
generated series and the requested set. There are three ways that I
know of to get a row number:
1) IIRC use a pl-pgsql function that returns an incremented number
2) use SQL by joining using the operator ">=" and Group by aggregate count(*)
3) 8.4 has sum new analytic functions that will do this nicely.
--
Regards,
Richard Broersma Jr.
Visit the Los Angeles PostgreSQL Users Group (LAPUG)
http://pugs.postgresql.org/lapug
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Bruce Momjian | 2008-10-15 19:28:59 | Re: Drupal and PostgreSQL - performance issues? |
| Previous Message | ries van Twisk | 2008-10-15 19:08:26 | Re: Numbering rows |