Re: Nearest Common Ancestor Report (XDb1's $1000 Challenge)

From: Leandro Guimaraens Faria Corsetti Dutra <leandro_at_dutra.fastmail.fm>
Date: Tue, 01 Jun 2004 17:20:54 -0300
Message-ID: <pan.2004.06.01.20.20.53.966095@dutra.fastmail.fm>

Em Fri, 21 May 2004 17:32:02 +1000, thirdrock escreveu:

>> You might be surprised to hear this, but there's a reason that the
>> relational model is called "relational". It's about storing relations.

>
> No, unless I miss-understood what you meant by that. A relation refers to
> the relationship between data members of the same 'table'. A 'table' was
> originally called a relation.

Well, that is then storing a relation.

Actually a table is not a relation, for it contains duplicates, while a relation is a set, therefore excluding duplicates.

What do you call data members? Actually a relation is defined as a subset of the cartesian product of some domains, relationships will only enter the picture if you consider the predicate a relationship -- but then I would feel like stretching the term.

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Received on Tue Jun 01 2004 - 15:20:54 CDT