Respuesta :

Composite keys are useful as identifiers of weak entities, where the weak entity has a strong parent-child relationship with the parent entity.

What are the entity sets?

The entity sets are the collection of entities which have the similar set of attributes.

Types of entity sets-

  • Weak entity set-Weak entity sets are those which does have not enough attributes as they can form a primary key.
  • Strong entity set-Strong entity sets are those which has primary key.
  • The relationship between strong and weak entity set is the type of parent-child.

Thus, the composite keys are useful as identifiers of weak entities, where the weak entity has a strong parent-child relationship with the parent entity.

Learn more about the entity sets here;

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