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Message from discussion 0 to Many relationship - Semantic Conceptual Modelling
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Joe "We are Borg" Foster  
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 More options Sep 16 1998, 3:00 am
Newsgroups: comp.databases.ms-access
From: j...@bftsi0.UUCP (Joe "We are Borg" Foster)
Date: 1998/09/16
Subject: Re: 0 to Many relationship - Semantic Conceptual Modelling
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In article <0U_K1.59$Zc2.569...@NewsRead.Toronto.iSTAR.net>, R...@RFDSystems.REMOVE.com (Rick) writes:
> Hi,
> Has anyone noticed that relational algebra breaks down here? I think this is
> important.

How so? By using the relational union and subtraction operations,
you can do the same tricks you can do using Access' outer joins.

> This is the other side of the NULL Argument coin,
> Nothing with anything is always nothing.
> In a nutshell; -If you have a 0-n relationship then you have an error in
> your model.

Assuming this is true, how then should such models be corrected?

--
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