On 12 Jan 2009, at 23:24, Alexandre Benson Smith wrote:

> Look for a message from 12/29/2008 from Richard Wesley, subject "Re:
> [firebird-support] Standard Deviation"

The answer to the larger issue of whether you can write aggregation
UDFs (e.g. MEDIAN) is "no".
________________________________________________________
Richard Wesley Senior Software Developer Tableau
Software
Visit: http://www.trytableau.com/now.html