Generally speaking,for a weak entity set to be meaningful it must be part of a

1. one-to-one relationship
2. one-to-many relationship
3. many-to-many relationship
4. depends on a particular situation

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Ritu Khare

  • May 12th, 2007

A weak entity is a part of one-to-many relationship, with the identifying entity on one-side of the relationship, and with total participation on many-side.

The weak entity relies on the identifying entity for its identification. The primary key of a weak entity is a composite key (PK of identifying entity(identifier), discriminator). There could exist more than one value of disciminator for each identifier.

Hence, the best way to model a weak entity is through a M:1 relationship.



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  • Jul 6th, 2015

4. depends upon particular situation

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