Exercise: Logical Database Design And The Relational Model

Questions for: Logical Database Design And The Relational Model

A primary key may be null.
A:
True
B:
False
C:
D:
Answer: B
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Weak entities do not get mapped into a relation.
A:
True
B:
False
C:
D:
Answer: B
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A relation is a two-dimensional table.
A:
True
B:
False
C:
D:
Answer: A
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A composite attribute does not get mapped into a relation.
A:
True
B:
False
C:
D:
Answer: A
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An enterprise key is a primary key whose value is unique for a given relation.
A:
True
B:
False
C:
D:
Answer: B
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