1649. Audit update — Real Estate — implementation variant 49

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

In a Real Estate application, implement this production problem: Record an employee salary change in an audit table in the same transaction. The API/service receives user input and must return or modify data safely. Give the SQL solution, explain why it works, and show how the same operation is called from the selected stack.

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Answer & Explanation

4 Answers

Verified

Option A

UPDATE the_table SET status='active';

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified Correct Answer

Option B

START TRANSACTION; UPDATE employees SET salary=:new_salary WHERE id=:employee_id; INSERT INTO employee_salary_audit(employee_id,old_salary,new_salary,changed_at) VALUES(:employee_id,:old_salary,:new_salary,NOW()); COMMIT;

Additional Explanation

The update and audit insert should commit together. Obtain the old value safely from a locked row or a trigger.

Verified

Option C

SELECT * FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified

Option D

DELETE FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.