Using the ERD diagram above, identify an attribute that might represent a Derived Attribute. Once you identify, explain why this is so.  Is this the only attribute? Are there others?

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Q: Hello, why on the diagram there are no associations or cardinalities?

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A:

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.