Re: database design method
From: Leandro Guimarães Faria Corsetti Dutra <lgcdutra_at_terra.com.br>
Date: Fri, 08 Nov 2002 12:16:27 +0100
Message-ID: <aqg6eb$9dma6$2_at_ID-148886.news.dfncis.de>
>
> Yes, domain and relvar definitions are also constraint definitions or
> rule definitions if you like more.
>
> And ERDs are never necessary, but it may be useful in order to give a
> quick view.
Date: Fri, 08 Nov 2002 12:16:27 +0100
Message-ID: <aqg6eb$9dma6$2_at_ID-148886.news.dfncis.de>
Alfredo Novoa wrote:
> On Mon, 04 Nov 2002 08:59:59 +0100,
> =?ISO-8859-1?Q?Leandro_Guimar=E3es_Faria_Corsetti_Dutra?= wrote:
>
>> Obviously he means to write the full model, from domains to relvars >> and constraints, and then choose specific portions that need to be >> graphically represented as ERDs or whatever.
>
> Yes, domain and relvar definitions are also constraint definitions or
> rule definitions if you like more.
>
> And ERDs are never necessary, but it may be useful in order to give a
> quick view.
Agreed.
> And ORM diagrams seems to be better than ERDs in all cases.
Can you expand or provide pointers?
-- _ / \ Leandro Guimarães Faria Corsetti Dutra +41 (21) 216 15 93 \ / http://homepage.mac.com./leandrod/ fax +41 (21) 216 19 04 X http://tutoriald.sourceforge.net./ Orange Communications CH / \ Campanha fita ASCII, contra correio HTML +41 (21) 644 23 01Received on Fri Nov 08 2002 - 12:16:27 CET