Which integrity rule ensures that a foreign key value matches an existing referenced key value or is NULL when permitted?
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)
B. Referential integrity
Detailed Explanation
- Referential integrity: Ensures that foreign key references remain valid.
- A foreign key value must match an existing referenced key value, or be NULL if the column permits NULL.
- It prevents invalid relationships between database tables.