An enterprise key is a primary key whose value is unique for a given relation.
Answer: B
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A primary key may be null.
Answer: B
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The entity integrity rule states that:
Answer: A
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A candidate key must uniquely identify each row.
Answer: A
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When mapping a multivalued attribute into a relation which of the following is true?
Answer: B
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When mapping a binary many-to-many relationship into a relation which of the following is true?
Answer: C
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When mapping a ternary relationship with an associative entity into a relation which of the following is true?
Answer: C
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Well-structured relations encourage anomalies of data.
Answer: B
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When mapping a regular entity into a relation which of the following is true?
Answer: A
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