Enhanced entity-relationship (EER) diagrams are basically an expanded version of ER diagrams. EER models are helpful tools for designing databases with high-level models. With their enhanced features, you can plan databases more thoroughly by delving into the properties and constraints with more precision.
An EER diagram provides you with all the elements of an ER diagram while adding:
Attribute or relationship inheritances
Category or union types
Specialization and generalization
Subclasses and superclasses
Overall, an EER diagram builds off of an ER diagram by including elements that allow for aggregating, generalizing, and specializing.
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