One of the benefits of transforming an entity type into a generalization hierarchy is the avoidance of null values in entities.

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By transforming an entity type into a generalization hierarchy, we create subtypes that inherit attributes and relationships from the parent type. This means that every instance of the parent type will be represented by one of its subtypes, eliminating the possibility of null values in the parent type. This is because every instance now belongs to one of the subtypes, each of which has a separate set of attributes and relationships.

One of the Benefits of Transforming an Entity Type into a Generalization