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Logical Database Design problems

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

3. A foreign key is which of the following?
Options
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

4. A primary key is which of the following?
Options
A. Any attribute
B. An attribute that uniquely identifies each row
C. An attribute that uniquely identifies each column
D. A derived attribute

6. A relation has which of the following properties?
Options
A. Each row is not unique.
B. Attributes can have the same name within a given table.
C. Each relation has a unique name.
D. The order of the columns is significant.

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

8. The entity integrity rule states that:
Options
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.

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

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