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.

Excellent observation Dave. Sometimes I can't see outside of the box I'm in. And at the time I was focusing on text so statistics was in another box. I've update post with final functions for mode(), median() and range().

Scott