Re: Extending my question. Was: The relational model and relational algebra - why did SQL become the industry standard?

From: Alfredo Novoa <>
Date: 18 Feb 2003 14:08:48 -0800
Message-ID: <>

"Mikito Harakiri" <> wrote in message news:<8BT2a.11$>...
> "Alfredo Novoa" <> wrote in message
> > I only want to add that duplicates also ruin updateable views.
> >
> >
> Why? View updates is about ability to solve equations with relational
> operators. While one can certainly claim that Set Algebra is superior to
> Bag Algebra, you have to demonstrate what exact technical difficulties are
> solving equations in the Bag Algebra.

The systematic approaches to the view update problem based on predicate logic does not work with bags.

Alfredo Received on Tue Feb 18 2003 - 23:08:48 CET

Original text of this message