3620. Multi-tenant: Find cross-tenant foreign-key mismatches. — Concurrency

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

In a multi-tenant module, solve this as a production problem using Concurrency: Find cross-tenant foreign-key mismatches. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

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Answer & Explanation

4 Answers

Verified Correct Answer

Option A

SELECT o.id FROM orders o JOIN customers c ON c.id=o.customer_id WHERE o.tenant_id<>c.tenant_id;

Additional Explanation

Tenant-aware foreign keys or application constraints should prevent cross-tenant references.

Verified

Option B

UPDATE table_name SET status='active';

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.

Verified

Option C

SELECT * FROM table_name;

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.

Verified

Option D

DELETE FROM table_name;

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.