1999. Status transition audit — 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: Find orders that changed from completed back to pending in an audit table. 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

Option B

DELETE FROM the_table;

Additional Explanation

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

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 Correct Answer

Option D

SELECT order_id,old_status,new_status,changed_at FROM order_status_audit WHERE old_status='completed' AND new_status='pending';

Additional Explanation

Audit history helps detect invalid state transitions without modifying source records.