Re: Requirements for update languages?

From: Jens Lechtenbörger <>
Date: 11 Nov 2002 07:58:50 +0100
Message-ID: <> (Alfredo Novoa) writes:

> On 08 Nov 2002 15:26:14 +0100, "Jens
> =?iso-8859-15?q?Lechtenb=F6rger?=" <> wrote:
> >while there are some criteria to assess relational query
> >languages (adequate, relationally complete, optimizable) I wonder
> >what makes a good update language for a data model.
> >
> >In particular, I wonder about the following points in SQL.
> The problems starts here because SQL is not relational.

OK. The "relational" before query language is misleading. I wondered about a good update language for the SQL data model.

> >1. I believe that SQL data manipulations are not adequate for
> >bags,
> A bag is not a relation and the Relational Model represents data
> in relations and only relations.
> Then SQL is not relational and it could be called "bagational" :-)
> With bags the view update problem is very diferent, and a lot more
> complex.

Are you sure? Do you have a reference?

Jens Received on Mon Nov 11 2002 - 07:58:50 CET

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