6. data integrity

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

What is the purpose of data integrity constraints?

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Answer & Explanation

4 Answers

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Option A

They automatically normalize every query.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

They disable transactions.

Additional Explanation

This option is incorrect for the stated requirement.

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Option C

They prevent invalid or inconsistent data states by enforcing rules such as uniqueness, valid references, required values and domain checks.

Additional Explanation

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

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Option D

They make every query return all rows.

Additional Explanation

This option is incorrect for the stated requirement.