17. constraint

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

Which statement best describes a CHECK constraint?

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Answer & Explanation

4 Answers

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Option A

It joins two unrelated databases.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

It automatically creates a view.

Additional Explanation

This option is incorrect for the stated requirement.

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Option C

It creates a backup.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option D

A CHECK constraint enforces a boolean condition on inserted or updated row values, subject to the DBMS's implementation rules.

Additional Explanation

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