Re: Re:
Date: Tue, 11 Feb 2003 09:54:54 -0000
Message-ID: <b2ahc8$oqm$1_at_sp15at20.hursley.ibm.com>
"The Oyster" <the_oyster_at_libero.it> wrote in message
news:ffdcf1a657981b3f9cbc56f60d3b7d65.46970_at_mygate.mailgate.org...
> Sorry for my bad English, probably I didn't explain well what it's my
> problem.
> I know how to choose and put relationships in a E-R diagram
> (I use ERWIN 4.1).
>
> The point is : how to set "attributes" in a relationship?
>
> Attributes are well defined in the theory of database design as
> "properties" of entities and relationships.
> In ERWIN is very easy to set attributes for entities;
> unfortunately it seems to be not so easy (perhaps impossible at all)
> for relationships.
Despite it's name, ERWin does not do ER models (not necessarily a bad thing IMO). It does
If anyone knows, I'ld be interested in the history of these notations and how they relate to Chen's original.
Regards
Paul Vernon
Business Intelligence, IBM Global Services
Received on Tue Feb 11 2003 - 10:54:54 CET