Re: Evolution of Date's "Abstract Machine" (via CM)
Date: 4 Jun 2005 04:21:10 -0700
Message-ID: <1117884070.811958.164580_at_g47g2000cwa.googlegroups.com>
>> Not exactly. The abstract machine, as I understand it (I don't have his
>> source references), is the relational data model - not a specific data
>> model, for a particular application. So while relational doesn't
>> evolve, my database for my application does.
>OK, thanks for this clarification. It is probably close to the mark.
>Date goes on (in the above ref) to define two meanings for the
>term "data model". The first and more fundamental meaning is given
>in the above definition.
[snip]
>He would probably acknowledge that the data model in the
>first sense (ie: the RM) only evolves though advance of
>"relational theory", such as a new database language.
Eric told you that the Relational Model does not evolve, and a new database language is not an advance in relational theory.
Regards Received on Sat Jun 04 2005 - 13:21:10 CEST