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

On Fri, May 22, 2009 at 03:23:07PM +0000, artacus(at)comcast(dot)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.

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

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