Re: The Theoretical Foundations of the Relational Model

From: Jan.Hidders <hidders_at_hcoss.uia.ac.be>
Date: 26 Jun 2002 09:57:51 +0200
Message-ID: <3d1973ff@news.uia.ac.be>

In article <3d18f41a.31020635_at_news.verizon.net>, JRStern <JXSternChangeX2R_at_gte.net> wrote:

> Actually, no, I am constitutionally unable to "know" what the three
> layer model is supposed to do for anybody, and this is a perfect
> example why.

Hm? There is a law in the US that forbids you to understand the ANSI/SPARC model? Or is it a health problem? :-)

> My question to you is why actual database engines and standards should
> not allow ordering as part of a view.

If you would have known the differences between internal schema, conceptual schema and external schema you would have known that I already gave an answer to that question. Views are in the external schema so ordering is allowed.

Jan Hidders

Received on Wed Jun 26 2002 - 02:57:51 CDT