Which integrity constraint ensures that a primary key cannot contain NULL values?
Options
- A. Entity integrity
- B. Referential integrity
- C. Domain integrity
- 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. Entity integrity
Detailed Explanation
- Entity integrity: Ensures that every row can be uniquely identified.
- It requires primary key values to be unique and non-NULL.
- This prevents records from having an unidentified primary key.