Re: Interesting article: In the Beginning: An RDBMS history
Date: Mon, 10 Apr 2006 08:26:07 +0300
"Marshall Spight" <marshall.spight_at_gmail.com> wrote in message
> x wrote:
> > I remember that the order of the rows is also irrelevant.
> > Why we name attributes with strings and we don't name the rows ? :-)
> > Why not the other way around ? :-)
> You smile, but it's actually an interesting question.
> The columns have an identity that must be unique; there is this rule
> that names identify columns.
Do you think the attributes as defined by Chris Date are "pointers" or not ? :-)
> The rows have an identity that must be unique; there is this rule
> that keys identify columns.
Why we insist the key be of the same degree for all rows of a relation ? :-)
> Coincidence? Are these two examples of the same rule, just with
> different key domains?
How about Codd's entity domains ? :-) Received on Mon Apr 10 2006 - 07:26:07 CEST