1476. Update using another table — E-commerce — implementation variant 26

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

In a E-commerce application, implement this production problem: Move employees into a target department based on a department mapping 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

SELECT * FROM the_table;

Additional Explanation

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

Verified

Option C

DELETE 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

UPDATE employees e JOIN department_mapping m ON m.employee_id=e.id SET e.dept_id=m.new_dept_id WHERE e.status='active';

Additional Explanation

MySQL supports UPDATE JOIN. Preview the same JOIN with SELECT before executing a large update.