18. referential integrity

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

What does referential integrity protect?

Looking for the latest Sarkari Result 2026 updates? Check the latest government exam results, merit lists and result updates on Sarkari Resultess.

Answer & Explanation

4 Answers

Verified

Option A

It guarantees every query uses an index.

Additional Explanation

This option is incorrect for the stated requirement.

Verified

Option B

It prevents all NULL values.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option C

It keeps foreign-key relationships valid so a referencing value points to an allowed parent key according to the constraint's rules.

Additional Explanation

Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.

Verified

Option D

It makes every column unique.

Additional Explanation

This option is incorrect for the stated requirement.