3 PAGES APA
- What is an entity supertype, and why is it used?
- What kinds of data would you store in an entity subtype?
- What is a specialization hierarchy?
- What is a subtype discriminator? Give an example of its use.
- What is an overlapping subtype? Give an example.
- What is a disjoint subtype? Give an example.
- What is the difference between partial completeness and total completeness?
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For Questions 8–10, refer to Figure Q5.8.
- List all of the attributes of a movie.
- According to the data model, is it required that every entity instance in the PRODUCT table be associated with an entity instance in the CD table? Why, or why not?
- Is it possible for a book to appear in the BOOK table without appearing in the PRODUCT table? Why, or why not?