Re: the two questions
Date: Wed, 28 Nov 2007 10:26:39 -0800 (PST)
On Nov 28, 10:09 am, vldm10 <vld..._at_yahoo.com> wrote:
> On Nov 27, 11:46 am, JOG <j..._at_cs.nott.ac.uk> wrote:
> > Again, all in the real world, before we get to a database.
> It seems to me that the discussion about the real world attributes is
> not precise and formal. Obviously it is enough to say that the
> identifier is the entity's attribute and that's that.
> Entity by definition is real world distinguishable thing. For example
> in my solution I defined that the identifier of the entity (or
> relationship) is the entity's attribute. You can see it on my web
> city. It is really simple.
> My identifier also is identifier of the entity's (or relationship)
> Btw, can be many combinations and cases - databases with abstract
> entities (Donald Duck, Mickey Mouse, Pegasus...)
> All computers' games are not from real world, there are databases for
> future (an annual budget, for example), multimedia db, etc.
> Vladimir Odrljin
I would like to add to my previous message that sometimes ( it seems to me) you mix technical and theoretical issues regarding the real world attributes.
Vl. Odrljin Received on Wed Nov 28 2007 - 19:26:39 CET