Which key uses a real-world attribute, such as an email address or passport number, to identify a record?
Options
- A. Surrogate key
- B. Foreign key
- C. Natural 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)
C. Natural key
Detailed Explanation
- Natural key: Uses an attribute that has real-world meaning to identify a record.
- Examples: Passport number or a unique national identification number.
- Unlike a surrogate key, it is based on meaningful real-world data.