Re: Aggregate Function to return most common value for a column

On Fri, May 22, 2009 at 05:23:47PM +0000, artacus@comcast.net wrote:
>
> On Fri, May 22, 2009 at 03:23:07PM +0000, artacus@comcast.net wrote:
> > > I want to use an aggregate function that will return the most
> > > commonly occurring value in a column.
> >
> > It's actually dead simple in Postgres. No C either. You just need to
> > create an aggregate function. I wrote a most() aggregate a while
> > back that does exactly what you are asking for. Here, I'll add it to
> > my blog...
> >
> > http://scottrbailey.wordpress.com/2009/05/22/postgres-adding-custom-aggregates-most/
>
> > Such an aggregate should probably be called, "mode," that being the
> > probability/statistics name for the concept.
>
> Excellent observation Dave. Sometimes I can't see outside of the box I'm in. And at the time I was focusing on text
sostatistics was in another box. I've update post with final functions for mode(), median() and range().  

Thanks! :)

Cheers,
David.
--
David Fetter <david@fetter.org> http://fetter.org/
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
Skype: davidfetter      XMPP: david.fetter@gmail.com

Remember to vote!
Consider donating to Postgres: http://www.postgresql.org/about/donate