Re: What is Weak Entity and Total participation
Date: Wed, 08 Feb 2006 22:33:48 GMT
> Can you please elaborate on the conceptof total participation of
> entities in ER Modelling?
The total participation of an entity (type) in a certain relationship means that every entity that belongs to the entity type participates in at least one instance of the relationship. For some more explanation see:
> How is it related to a weak entity? Does a weak entity have to
> participate in a total participation?
Yes. Weak entities cannot be identified by their own attributes but also require the attributes of another entity. (Note: the definition of 'weak entity' may actually differ a bit, depending upon the text-book you are using.) With this other entity they therefore must have some kind of relationship in which their participation is total.
This is not a full explanation but just a hint to push you in the right direction. If you ask inelligent questions more explanation will become available.
- Jan Hidders