Re: Conceptual Data Model in Designer/2000

[Quoted] 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 [Quoted] analysis anyway.

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