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The Relational Model and Normalization
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Question
The different classes of relations created by the technique for preventing modification anomalies are called:
Options
A. normal forms.
B. referential integrity constraints.
C. functional dependencies.
D. None of the above is correct.
Correct Answer
normal forms.
More questions
1. Concurrency control is important for which of the following reasons?
Options
A. To ensure data integrity when updates occur to the database in a multiuser environment
B. To ensure data integrity when updates occur to the database in a single-user environment
C. To ensure data integrity while reading data occurs to the database in a multiuser environment
D. To ensure data integrity while reading data occurs to the database in a single-user environment
Show Answer
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Correct Answer: To ensure data integrity when updates occur to the database in a multiuser environment
2. User views are included as part of which schema?
Options
A. Internal
B. Conceptual
C. External
D. None of the above.
Show Answer
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Correct Answer: External
3. Which of the following is an ordered collection of elements of the same type?
Options
A. Set
B. Bag
C. List
D. Dictionary
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Correct Answer: List
4. The fact that the same operation may apply to two or more classes is called what?
Options
A. Inheritance
B. Polymorphism
C. Encapsulation
D. Multiple classification
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Correct Answer: Polymorphism
5. The benefits of object-oriented modeling are which of the following?
Options
A. The ability to tackle more challenging problems
B. Reusability of analysis, design, and programming results
C. Improved communication between users, analysts, etc.
D. All of the above.
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Correct Answer: All of the above.
6. A heterogeneous distributed database is which of the following?
Options
A. The same DBMS is used at each location and data are not distributed across all nodes.
B. The same DBMS is used at each location and data are distributed across all nodes.
C. A different DBMS is used at each location and data are not distributed across all nodes.
D. A different DBMS is used at each location and data are distributed across all nodes.
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Correct Answer: A different DBMS is used at each location and data are distributed across all nodes.
7. Which SQL-92 standard SQL command can be used to change a table name?
Options
A. RENAME TABLE
B. CHANGE TABLE
C. ALTER TABLE
D. None of the above is correct.
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Correct Answer: None of the above is correct.
8. The rows of the result relation produced by a SELECT statement can be sorted, but only by one column.
Options
A. True
B. False
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Correct Answer: False
9. Market basket analysis primarily uses the technique of conditional probabilities.
Options
A. True
B. False
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Correct Answer: False
10. A stored procedure is a program that performs some common action on database data and is stored in the database.
Options
A. True
B. False
Show Answer
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Correct Answer: True
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