Re: Natural keys vs Aritficial Keys
From: paul c <toledobythesea_at_oohay.ac>
Date: Sat, 30 May 2009 02:30:12 GMT
Message-ID: <US0Ul.28567$Db2.7806_at_edtnps83>
> Minimal theory of what? A relational database by definition has
> relvars. Relvars are essential to relational database theory.
> ....
Date: Sat, 30 May 2009 02:30:12 GMT
Message-ID: <US0Ul.28567$Db2.7806_at_edtnps83>
David BL wrote:
>....
> Minimal theory of what? A relational database by definition has
> relvars. Relvars are essential to relational database theory.
> ....
I think you have looked at TTM with the same casualness as you proof your own paragraphs. TTM is about a language, very little of it has to do with the RM, certainly not relvars.
> The topic of discussion concerns the First Great Blunder which by
> definition concerns the equation relvar = object class.
>
I think D&D thought it a waste of time to enumerate all blunders, so they stopped at two. Received on Sat May 30 2009 - 04:30:12 CEST