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@xxxxxx -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
