Re: aggregate function stddev

Is this a TODO?

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Josh Berkus wrote:
> Kemin,
> 
> > Just noticed that the postgres stddev is the stddev_sample formula.
> > There are two different ways to calculate this value.
> > Their difference is very small with large samle size.  It would be nice
> > to distinguish the two different versions.
> 
> Note sent to PGSQL-DOCS.
> 
> > I also noticed that oracle has stddev_sample and stddev_population.
> > This is just a wish list.
> 
> Were you aware that in PostgreSQL you can write your own aggregates?   It's 
> relatively easy to do.
> 
> -- 
> Josh Berkus
> Aglio Database Solutions
> San Francisco
> 
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