Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> comp.databases.theory -> Re: Database-valued attributes?

Re: Database-valued attributes?

From: Jonathan Leffler <jleffler_at_earthlink.net>
Date: Wed, 12 Nov 2003 05:11:36 GMT
Message-ID: <cijsb.8002$nz.6409@newsread2.news.pas.earthlink.net>


Paul Vernon wrote:
> Q. Do D&D explicitly define what a possiable representaion is. I.e. is a
> poss rep with more than 1 component a tuple of those components, or a list,
> a set, an array or just 'a thing with components'?
>
> E.g. would
>
> POSSREP XY_POINT { X NUMERIC, Y NUMERIC }
>
> be the same poss rep as
>
> POSSREP XY_POINT { Y NUMERIC, X NUMERIC }
>
> in thier book?

Those would be the same, I'm sure. The attributes are identified by name, not position. See the Database Foundation Papers #3, IIRC, at dbdebunk.com.

-- 
Jonathan Leffler                   #include <disclaimer.h>
Email: jleffler_at_earthlink.net, jleffler_at_us.ibm.com
Guardian of DBD::Informix v2003.04 -- http://dbi.perl.org/
Received on Tue Nov 11 2003 - 23:11:36 CST

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US