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Pregunta 1
Pregunta
A data model is usually graphical.
Respuesta
- True
- False
Pregunta 2
Pregunta
2. An implementation-ready data model needn't necessarily contain enforceable rules to guarantee the integrity of the data.
Respuesta
- True
- False
Pregunta 3
Pregunta
3. An implementation-ready data model should contain a description of the data structure that will store the end-user data.
Respuesta
- True
- False
Pregunta 4
Pregunta
4. Within the database environment, a data model represents data structures with the purpose of supporting a specific problem domain.
Respuesta
- True
- False
Pregunta 5
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5. Even when a good database blueprint is available, an applications programmer’s view of the data should match that of the manager and the end user.
Respuesta
- True
- False
Pregunta 6
Pregunta
6. In the context of data models, an entity is a person, place, thing, or event about which data will be collected and stored.
Respuesta
- True
- False
Pregunta 7
Pregunta
7. Database designers determine the data and information that yield the required understanding of the entire business.
Respuesta
- True
- False
Pregunta 8
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8. Business rules apply to businesses and government groups, but not to other types of organizations such as religious groups or research laboratories.
Respuesta
- True
- False
Pregunta 9
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9. Business rules must be rendered in writing.
Respuesta
- True
- False
Pregunta 10
Pregunta
10. In an SQL-based relational database, each table is dependent on every other table.
Respuesta
- True
- False
Pregunta 11
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11. In an SQL-based relational database, rows in different tables are related based on common values in common attributes
Respuesta
- True
- False
Pregunta 12
Pregunta
12. A disadvantage of the relational database management system (RDBMS) is its inability to hide the complexities of the relational model from the user.
Respuesta
- True
- False
Pregunta 13
Pregunta
13. Each row in the relational table is known as an entity instance or entity occurrence in the ER model.
Respuesta
- True
- False
Pregunta 14
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14. In Chen notation, entities and relationships have to be oriented horizontally; not vertically.
Respuesta
- True
- False
Pregunta 15
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15. M:N relationships are not appropriate in a relational model.
Respuesta
- True
- False
Pregunta 16
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16. Today, most relational database products can be classified as object/relational.
Respuesta
- True
- False
Pregunta 17
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17. The network model has structural level dependence.
Respuesta
- True
- False
Pregunta 18
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18. The external model is the representation of the database as “seen” by the DBMS.
Respuesta
- True
- False
Pregunta 19
Pregunta
19. The hierarchical model is software-independent.
Respuesta
- True
- False
Pregunta 20
Pregunta
20. The relational model is hardware-dependent and software-independent.
Respuesta
- True
- False
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