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Logical Database Design
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Question
If a relation is in third normal form, it does not need to be in second normal form.
Options
A. True
B. False
Correct Answer
False
Logical Database Design problems
Search Results
1. A synonym is two or more attributes that have different names but the same meaning.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
2. A composite attribute does not get mapped into a relation.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
3. A candidate key must uniquely identify each row.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
4. A null value is assigned when no other value applies.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
5. A relation is a two-dimensional table.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
6. Well-structured relations encourage anomalies of data.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
7. A foreign key may be null and still adhere to the referential integrity constraint.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
8. The primary key in a relation does not need to be underlined.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
9. The joining technique is useful when data from several relations are to be retrieved and displayed and the relationships are not necessarily nested.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
10. There should be one condition within the WHERE clause for each pair of tables being joined.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
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