| From: | Michael Fuhr <mike(at)fuhr(dot)org> |
|---|---|
| To: | Chris <dmagick(at)gmail(dot)com> |
| Cc: | Fabio Victora Hecht <fabiovh(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: count and limit |
| Date: | 2006-08-18 00:49:33 |
| Message-ID: | 20060818004932.GA93594@winnie.fuhr.org |
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| Lists: | pgsql-general |
On Fri, Aug 18, 2006 at 10:34:44AM +1000, Chris wrote:
> Fabio Victora Hecht wrote:
> >I was wondering if there's a way to count the results of a query and
> >return part of the result set it in one query (LIMIT). Because I usually
> >have to count the results using one query (to tell the user how many
> >records match the criteria) and show the first 20 records.
>
> I was going to suggest a cursor but I don't think you can get the number
> of results a cursor has :(
You can but you have to MOVE to the end, so the backend has to visit
each tuple just as it would for COUNT. I answered a similar question
recently:
http://archives.postgresql.org/pgsql-novice/2006-07/msg00220.php
--
Michael Fuhr
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