Which key is a minimal superkey that uniquely identifies each record in a relation?
Options
- A. Candidate key
- B. Foreign key
- C. Secondary key
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
A. Candidate key
Detailed Explanation
- Candidate key: A minimal superkey that uniquely identifies each record.
- It contains no unnecessary attributes.
- Every candidate key is a superkey, but every superkey is not necessarily a candidate key.