Re: The horse race
From: Mark Johnson <102334.12_at_compuserve.com>
Date: Thu, 23 Feb 2006 16:17:05 -0800
Message-ID: <1ujsv1t7ugamgr1lh895qpte5srm08tlj8_at_4ax.com>
Date: Thu, 23 Feb 2006 16:17:05 -0800
Message-ID: <1ujsv1t7ugamgr1lh895qpte5srm08tlj8_at_4ax.com>
"JOG" <jog_at_cs.nott.ac.uk> wrote:
>I would avoid this example guys as it centres around the subtle
Then you should define the "subtle distinction" if one is not the
>distinction between a mathematical relation and a db-relation.
Codd spoke of tables, as I understand it. I'm not sure a table corresponds to a relation, however.
>former ordering of elements within the tuple does matter
Because they are ordered by position.
>and in the latter it does not due to column names
Because they are named, which corresponds to a keyword/value pairing.
>i.e. you're both right from a different foundational assumption.
Received on Fri Feb 24 2006 - 01:17:05 CET