Re: Aggregates: Largest Groups

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)
>> wrote:
>>
>>>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?

Sincerely,

Gene Wirchenko Received on Mon Mar 22 2010 - 22:19:26 CET