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Re: In an RDBMS, what does "Data" mean?

From: Dawn M. Wolthuis <dwolt_at_tincat-group.com>
Date: Sun, 13 Jun 2004 09:48:36 -0500
Message-ID: <cahpg9$bg6$1@news.netins.net>


"x" <x-false_at_yahoo.com> wrote in message news:40c98cce$1_at_post.usenet.com...
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> "Anthony W. Youngman" <wol_at_thewolery.demon.co.uk> wrote in message
> news:C033GQQQL7xAFwgd_at_thewolery.demon.co.uk...
>
> > So if I put my data into an MV database I can access it as if it were in
> > an RDBMS. However, the converse is not true.
>
> So all data in a MV database can be represented in relational model,
> but not all data in a RDBMS can be represented in MV model :-)
>
> Which one is more expressive ? :-)

Easy question --

if each model can provide a solution for a particular area so that we have both an MV and a SQL-DBMS solution and

if we can look at the MV model as relational when we choose to do so (which is usually for the purpose of using SQL against it)

but we cannot take the relational model and view the MV model from it

Then clearly the more expressive language is ... NOT the one that loses the ability to view the data in some other way, right? --dawn Received on Sun Jun 13 2004 - 09:48:36 CDT

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