On 21/01/2015 14:38, Pierre Hsieh wrote:
>
>
> Hi,
>
>
>
> Would you please tell me whether PostgreSQL can execute the following
> tasks? If not, please also tell me which one can help me for that. Thanks
Not clear what you're asking, but if you just want to find the standard
deviation of a sample then that's no problem:
http://www.postgresql.org/docs/9.4/static/functions-aggregate.html#FUNCTIONS-AGGREGATE-STATISTICS-TABLE
Hope this helps,
Ray.
--
Raymond O'Donnell :: Galway :: Ireland
rod@iol.ie