Re: Multiple-Attribute Keys and 1NF
From: mAsterdam <mAsterdam_at_vrijdag.org>
Date: Thu, 30 Aug 2007 02:14:58 +0200
Message-ID: <46d60bd9$0$237$e4fe514c_at_news.xs4all.nl>
...
>
> Yes. I mean no. No, yes. Gnngh ;)
>
> Ok, of course I understand your point - a wire can be viewed as having
> a colour code, which itself has constituent parts. But its just one
> interpretation right. I am still seeing a difference between the
> propositions:
> * There is a colour-code "yellow and green" that denotes "earth".
> * The casing of an earth wire features the colour yellow and the
> colour green.
Date: Thu, 30 Aug 2007 02:14:58 +0200
Message-ID: <46d60bd9$0$237$e4fe514c_at_news.xs4all.nl>
JOG schreef:
> David Cressey wrote:
>> Clearly what we have here is not a domain of colors, but a domain of color >> codes, where a color code contains one or more colors, and maybe a "thick >> or thin" qualifier on each color.
...
>> I think that the colors, as constituents of color codes, play the same role >> as bits, as constituents of character codes. Do you agree?
>
> Yes. I mean no. No, yes. Gnngh ;)
>
> Ok, of course I understand your point - a wire can be viewed as having
> a colour code, which itself has constituent parts. But its just one
> interpretation right. I am still seeing a difference between the
> propositions:
> * There is a colour-code "yellow and green" that denotes "earth".
> * The casing of an earth wire features the colour yellow and the
> colour green.
So, the question becomes: what is it that you are interested in?
> Its just like the difference between the propositions:
> * My office is B42
> * My office is on floor B, room 42.
Likewise. Form /follows/ function, it does not/should not dictate it.
> There are instances where I may well want to encode as the second
> proposition forms. And /if/ that were the case (iff), well 1NF is
> precluding me from doing this in terms of the wire example.
Received on Thu Aug 30 2007 - 02:14:58 CEST