Re: separation of church and state?
Date: Mon, 08 Oct 2007 11:27:14 -0300
Message-ID: <470a3e0a$0$14841$9a566e8b_at_news.aliant.net>
David Cressey wrote:
> "paul c" <toledobythesea_at_ooyah.ac> wrote in message
> news:1yPNi.6595$_K.6240_at_pd7urf3no...
>
>>David Cressey wrote:
>>...
>>
>>>I think you're extrapolating Date's remarks to a point that he might not
>>>agree with. A table with an index is still a table.
>>>...
>>
>>I *suppose* it is but only in the interest of getting along with the
>>rest of the world, most of whom I think would agree with you. It's just
>>that I've never seen a formal definition of a table as a mathematical
>>object, only as a graphical analogy to a relation, without respect to an
>>algebra.
> > I wouldn't call a table a "graphical analogy". I'd call it a logical data > structure that serves to implement the storage of a relation.
If it is logical data structure, then it is an alternative to a relation, which is accurate in the context of SQL.
>>Therefore, I don't understand how dbms's manipulate tables in
>>a relational way. It seems to me that they must need to manipulate
>>relations or relation variables instead.
>
> An SQL DBMS manipulates tables, not relations or relational variables.
Exactly. Received on Mon Oct 08 2007 - 16:27:14 CEST