Re: A question in ER modelling
From: Jan Hidders <jan.hidders_at_REMOVETHIS.pandora.be>
Date: Tue, 14 Feb 2006 22:12:18 GMT
Message-ID: <6BsIf.257409$re.7801994_at_phobos.telenet-ops.be>
Date: Tue, 14 Feb 2006 22:12:18 GMT
Message-ID: <6BsIf.257409$re.7801994_at_phobos.telenet-ops.be>
Abhishek wrote:
> Hi,
> Say I have an entity A on the left and entity B on the right in the ER
> diagram. Now if the situtation is such that any entity instance in
> entity type A is associated with all the entity instances of entity
> type B, how do I represent it in the ER diagram?
You can't, unless you are talking about some ERD dialect with more sophisticated integrity constraints than usual.
> How is it different
> from the 1:M or M:1 or M:N relation type?
Depending upon the number of allowed entities in entity type A and B it could be any of those.
- Jan Hidders