Re: Entity Relatioship Diagrammer Question

"Jeroen van Veldhuizen" <Jeroenvv_at_planet.nl> wrote in message news:3911B45D.88495BCF_at_planet.nl...
> Sandy Pleyte wrote:
>
> > Hi,
> >
> > When i create an entity, en and I ask for the attributes
> > (properties->attributes), I can insert the Fields, but where can i
 specify
> > NULL/NOT NULL and that a field has to be incremental.
> >
> > Regards,
> >
> > Sandy Pleyte
>
> You should distinguish your ER model from your physical data model.
 null/not
> null and incremental things are not really things you store in an ER
 model.
> Null/not null would translate to an optional or mandatory attribute. That
 an
> attribute would map to a sequence is not an attribute option.
> In the technical data model you can store this information. There you can
> specify the null/not null option and if a column should be populated by a
> sequence.

Where can i find the technical Data model ??

Regards,

Sandy Received on Tue May 09 2000 - 00:00:00 CEST