Re: Aggregates: Largest Groups
Date: Mon, 22 Mar 2010 14:19:26 -0700
On Mon, 22 Mar 2010 16:12:50 -0500, david_at_fetter.org (David Fetter) wrote:
>Gene Wirchenko <genew_at_ocis.net> wrote:
>> On Mon, 22 Mar 2010 15:42:09 -0500, david_at_fetter.org (David Fetter)
>>>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?
>> First, define your terms. What is a group? What does "larger
>> than X" mean? (Size of vehicle? Number of vehicles in the group?)
>Number of vehicles in the group.
And what is a group?
Gene Wirchenko Received on Mon Mar 22 2010 - 16:19:26 CDT