2015-01-21 16:37 GMT+01:00 Raymond O'Donnell <rod@iol.ie>:
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: