Re: What is Weak Entity and Total participation

From: Jan Hidders <>
Date: Wed, 08 Feb 2006 22:33:48 GMT
Message-ID: <gluGf.244161$>

Abhishek wrote:
> Hi,
> 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
Received on Wed Feb 08 2006 - 23:33:48 CET

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