19. quiz
- 1. 1 Quiz About Entity Relationship
- 2. 2 Question 1 An entity is A. A real physical “thing” that is specific to a particular database management system C. A “thing” which has either a real physical existence (e.g. a car or a student) or a conceptual existence (e.g. a course) B. A real physical “thing” or a conceptual “thing” that is specific to a particular database management system D. Any physical “thing” that exists in the real world
- 3. 3 Question 2 The symbol represents a A. A one to one relation C. A many to many relation B. A many to one relation D. A one to many relation
- 4. 4 Question 3 The graphic indicates A. A student can own many cars and a car can be owned by many students C. A car can be owned by many students B. That a student can own 0,1 or more cars D. A student cannot own a car
- 5. 5 Question 4 The symbol represents A. An entity C. An attribute B. A record D. A relation
- 6. 6 Question 5 An instance is A. Any particular entity C. An attribute of an entity B. A particular occurrence of an entity (e.g. Tom is an instance of the entity STUDENT) D. A special type of relation
- 7. 7 Question 6 The ER model is meant to A. Enable detailed descriptions of data query processing C. Enable low level descriptions of data B. Replace relational design D. Be close to a users perception of the data
- 8. 8 Question 7 This graphic A. Indicates that many students can attend many courses C. Indicates that there is a missing entity B. Indicates that students have to attend more than one course D. Indicates that students attend courses
- 9. Which of the following statements best describes the function of an entity relation 9 model A. An ER model is concerned primarily with a logical view of the data and secondly with the physical implementation C. An ER model provides a view of the logic of the data and not the physical implementation B. An ER model is concerned primarily with a physical implementation of the data and secondly with the logical view D. An ER model is entirely concerned with modeling the physical implementation
- 10. 10 Key • 1) D • 2) D • 3) B • 4) A • 5) B • 6) D • 7) C