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Database Systems: Concepts, Design and Applications by S. K. Singh

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Review Questions

1.What are the disadvantages or limitations of an E-R Model? What led to the development of EER model?
2.What do you mean by superclass and subclass entity types? What are the differences between them? Explain with an example.
3.Using a semantic net diagram, explain the concept of superclasses and subclasses.
4.With an example, explain the notations used for EER diagram while designing database for an enterprise.
5.What do you mean by attribute enheritance? Why do we use it in EER diagram? Explain with an example.
6.Differentiate between a shared subtype and a multiple enheritance.
7.What are the conditions that must be considered while deciding on supertype/subtype relationship? Explain with an example.
8.What are the advantages ...

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