aggregate function stddev - Mailing list pgsql-sql

From Kemin Zhou
Subject aggregate function stddev
Date
Msg-id 413F758A.80306@ferring.com
Whole thread Raw
Responses Re: aggregate function stddev  (Josh Berkus <josh@agliodbs.com>)
List pgsql-sql
Implementers:

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. 

I also noticed that oracle has stddev_sample and stddev_population. 
This is just a wish list. 

Kemin



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