Re: object algebra
From: Neo <neo55592_at_hotmail.com>
Date: 26 Feb 2004 08:15:41 -0800
Message-ID: <4b45d3ad.0402260815.57cee86f_at_posting.google.com>
Date: 26 Feb 2004 08:15:41 -0800
Message-ID: <4b45d3ad.0402260815.57cee86f_at_posting.google.com>
> > It was a figurative expression meaning reality can be the source for
> > providing values in a relation's tuples. Reality may provide a person
> > with two eyes and a person with no eyes. In RDM, the rules say define
> > a relation's header at time X. RDM's rules forces us to presuppose
> > that the attributes of future tuples will fit the definition at time
> > X.
>
> I don't see any room in this explanation for the role that ALTER TABLE plays.
Although TDM/XDb1 can present things as a tables, trees or sentences, internally it does not have any tables (unlike RDM). Received on Thu Feb 26 2004 - 17:15:41 CET