Re: Normalization and DBMS
Date: Wed, 12 May 2004 15:02:44 GMT
Message-ID: <40a23923.27106146_at_news-read3.maxwell.syr.edu>
On Wed, 12 May 2004 09:23:44 -0500, "Dawn M. Wolthuis" <dwolt_at_tincat-group.com> wrote:
>According to the new definitions of normalization by folks such as Date,
>relation-valued attributes are now acceptable.
But not very useful in base tables.
> So, the OO, XML, PICK and/or
>others who have accepted non-1NF data structures in spite of tremendous
>pressure from the SQL-DBMS folks to do otherwise just might have had some
>little influence in helping relational theory be a bit more useful.
Perhaps, but they are still fundamentally wrong.
>course, it is also possible that relational theorists, when looking at the
>theory itself saw that there was nothing logical about excluding "repeating
>groups"
Repeating groups like in Leandro's example are a very bad practice, but they don't have relationship with 1NF.
Regards
Alfredo
Received on Wed May 12 2004 - 17:02:44 CEST