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Database - Logical Database Design

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Home » Engineering » Database » Logical Database Design » General Questions

Exercise :: Logical Database Design - General Questions

1. 

The entity integrity rule states that:
A. no primary key attribute may be null.
B. no primary key can be composite.
C. no primary key may be unique.
D. no primary key may be equal to a value in a foreign key.

Answer: Option A

Explanation:

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2. 

When mapping a many-to-many unary relationship into a relation which of the following is true?
A. One relation is created.
B. Two relations are created.
C. Three relations are created.
D. Four relations are created.

Answer: Option B

Explanation:

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3. 

If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?
A. First normal form
B. Second normal form
C. Third normal form
D. Fourth normal form

Answer: Option B

Explanation:

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4. 

A foreign key is which of the following?
A. Any attribute
B. The same thing as a primary key
C. An attribute that serves as the primary key of another relation
D. An attribute that serves no purpose

Answer: Option C

Explanation:

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5. 

A transitive dependency is which of the following?
A. A functional dependency between two or more key attributes.
B. A functional dependency between two or more nonkey attributes.
C. A relation that is in first normal form.
D. A relation that is in second normal form.

Answer: Option B

Explanation:

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