Aggregates: Largest Groups
From: David Fetter <david_at_fetter.org>
Date: Mon, 22 Mar 2010 15:42:09 -0500
Message-ID: <pbydnfHTA4G8SzrWnZ2dnUVZ_vidnZ2d_at_speakeasy.net>
Date: Mon, 22 Mar 2010 15:42:09 -0500
Message-ID: <pbydnfHTA4G8SzrWnZ2dnUVZ_vidnZ2d_at_speakeasy.net>
Hello,
Let's say I have a traffic monitoring system. The stream of data
coming in records a timestamp and a speed for each vehicle.
I'd like to know what all the groups of vehicles larger than X whose
with average speed over Y is.
Any ideas how to approach this?
Cheers,
David
-- David Fetter <david_at_fetter.org> http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fetter_at_gmail.com Build it, and they will come^Hplain.Received on Mon Mar 22 2010 - 21:42:09 CET