Re: Conceptual Data Model in Designer/2000

Hello

I´m working with many to many ralationship without problem... You must define it at conceptual level but you can include the atribute you want at design level ( data squema ), it works fine ...

TIMJH_at_my-dejanews.com escribió en artículo <6sp3ht$3c7$1_at_nnrp1.dejanews.com>...
> In article <35EFC118.593E6FAE_at_esrin.esa.it>,
> bernard.sautet_at_esrin.esa.it wrote:
> > Hi,
> >
> > I wonder how to create a Conceptual Data Model in Designer/2000.
> >
> > Let's take a simple example : let's condider two entities CUSTOMER and
> > ITEMS
> > At conceptual level, these entities are linked by a many-to-many
> > relation "INVOICE" that has an attribute "invoice amount".
> > INVOICE is a relation with an attribute not an entity.
> >
> > How can I draw that ?
> > Does Designer/2000 allow the creation of Conceptual Data Models ?
>
> You should create Invoice as an entity in it's own right, since it has
> attributes of it's own. Many-to-many relationships should only used when
> they don't have any attributes. Such relationships often disappear
 during
> analysis anyway.
>
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  Received on Tue Sep 08 1998 - 00:00:00 CEST