Re: Groupings

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From: Richard Knapp (gyp_caver_at_yahoo.com)
Date: Thu Feb 01 2001 - 15:29:03 CET 

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From: "Richard Knapp" <gyp_caver_at_yahoo.com>
To: "cavexml_at_cartography.ch" <cavexml_at_cartography.ch>
Date: Thu, 01 Feb 2001 09:29:03 -0500 (EST)
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Subject: Re: Groupings
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>A "survey" to me, only represents data that was collected at one particular instance and
>as such, by construction, share common attributes.

Reasonable point. Let's take a survey then, say the "A". It was started on 1-Jan-2001. The
next trip with a new crew continued the survey (2-Jan-2001). A couple months later (after
beating out some smaller leads), the survey was continued with the original crew
(9-Sep-2001). This is one survey -- the A -- but done in three parts. How would this
accurately be recorded?

>> Using keywords embedded in attributes is not a good way to identify
>>roupings. There isn't a space restriction on what can be put into this
>> format. And there is no penalty for devising a "perfect" format then
>>downscaling it to a "useful" one.

>I disagree totally. That is the whole point of a relational database, to group data by
>attributes. The data doesn't have the groupings, the queries performed on the data does.
>What you don't want is to build into the data groupings that are not mutally exclusive,
>e.g. how do I group by time and group by location in the same data file?

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