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1- What is an entity supertype- and why is it used- 2- What kinds of d.pdf

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afgt2012

The document discusses fundamental database design concepts, including entity supertypes and subtypes, specialization hierarchies, and types of subtypes such as overlapping ones. It explains the importance of completeness in data representation and conditions related to primary keys and relationships. Additionally, it covers aggregation, composition, generalization, and specialization as critical concepts in structuring data.

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1. What is an entity supertype, and why is it used? 2. What kinds of data would you store in an entity subtype? 3. What is a specialization hierarchy? 4. What is an overlapping subtype? Give an example. 5. What is the difference between partial completeness and total completeness? 8. Is it possible for a book to appear in the BOOK table without appearing in the PRODUCT table? Why or why not? 9. Under what circumstances are composite primary keys appropriate? 10. What is Aggregation and Composition? 11. What is Generalization and Specialization?

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1- What is an entity supertype- and why is it used- 2- What kinds of d.pdf

  • 1. 1. What is an entity supertype, and why is it used? 2. What kinds of data would you store in an entity subtype? 3. What is a specialization hierarchy? 4. What is an overlapping subtype? Give an example. 5. What is the difference between partial completeness and total completeness? 8. Is it possible for a book to appear in the BOOK table without appearing in the PRODUCT table? Why or why not? 9. Under what circumstances are composite primary keys appropriate? 10. What is Aggregation and Composition? 11. What is Generalization and Specialization?