In an ERD,each generalization hierarchy must participate in at least one relationship with an entity type not in the generalization hierarchy.

Name: In an ERD,each generalization hierarchy must participate in at least one relationship with an entity type not in the generalization hierarchy.
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This is called the completeness constraint and ensures that the generalization hierarchy is not isolated from the rest of the ERD. It also helps to avoid modeling errors such as redundant or superfluous entities.

In an ERD,each Generalization Hierarchy Must Participate in at Least