Re: FW: Random Selection from TABLE

I don't know how efficient it would be, but you could always do:

select * from mytable order by random() limit 1;

-philip

On Thu, 20 Dec 2001, Salvatore Sferrazza wrote:

> I've implemented something like this before, the way we solved it was by
> having a list of "candidate" images in a table indexed by some entity.  We
> then used the front end tool (in our case, Java) to select the candidates,
> cache them and then pull randomly from the cache upon rendering the
> page.  Asking SQL to do this may not be the best idea, since you don't
> want one more round-trip per page.
>
> HTH,
>
> Sal
>
> On Fri, 21 Dec 2001, Kris-Jon Fenton wrote:
>
> > Yes, I do have a question, how do I do this?
> >
> > -----Original Message-----
> > From: pgsql-novice-owner@postgresql.org
> > [mailto:pgsql-novice-owner@postgresql.org]On Behalf Of Josh Berkus
> > Sent: Friday, 21 December 2001 2:41 AM
> > To: Kris-Jon Fenton; pgsql-novice@postgresql.org
> > Subject: Re:  FW: Random Selection from TABLE
> >
> >
> > Kris,
> >
> > > I want to be able to select entries randomly so I can change the
> > > images on a
> > > website using PHP.
> > >
> > > Basically I need to have a randomly rotating image that will change
> > > whenever
> > > the page is refreshed.
> > >
> > > I want to store the image names in a table and have them selected
> > > from
> > > there.
> >
> > Sounds like fun!  Do you have a question for the list?
> >
> > -Josh
> >
> > ______AGLIO DATABASE SOLUTIONS___________________________
> >                                        Josh Berkus
> >   Complete information technology      josh@agliodbs.com
> >    and data management solutions       (415) 565-7293
> >   for law firms, small businesses        fax 621-2533
> >     and non-profit organizations.      San Francisco
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 2: you can get off all lists at once with the unregister command
> >     (send "unregister YourEmailAddressHere" to majordomo@postgresql.org)
> >
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 6: Have you searched our list archives?
> >
> > http://archives.postgresql.org
> >
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: Have you searched our list archives?
>
> http://archives.postgresql.org
>