Re: Aggregates: Largest Groups

From: David Fetter <>
Date: Mon, 22 Mar 2010 16:12:50 -0500
Message-ID: <>

Gene Wirchenko <> wrote:

> On Mon, 22 Mar 2010 15:42:09 -0500, (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.


David Fetter <>
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Received on Mon Mar 22 2010 - 22:12:50 CET

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