Which key is selected from the candidate keys to uniquely identify records in a table?
Options
- A. Primary key
- B. Foreign key
- C. Alternate 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. Primary key
Detailed Explanation
- Primary key: The candidate key selected to uniquely identify records in a table.
- A primary key must contain unique values and cannot contain NULL values.
- A table can have only one primary key constraint, which may contain multiple columns.