2069. Recursive hierarchy: Return the full employee hierarchy from top-level managers. — Node.js + Express + Sequelize

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

In a recursive hierarchy module, solve this as a production problem using Node.js + Express + Sequelize: Return the full employee hierarchy from top-level managers. 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

WITH RECURSIVE org AS (SELECT id,name,manager_id,0 level FROM employees WHERE manager_id IS NULL UNION ALL SELECT e.id,e.name,e.manager_id,o.level+1 FROM employees e JOIN org o ON e.manager_id=o.id) SELECT * FROM org ORDER BY level,id;

Additional Explanation

Recursive CTEs walk parent-child hierarchies. Protect against cycles through data constraints or cycle detection strategy.

Verified

Option B

SELECT * FROM table_name;

Additional Explanation

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

Verified

Option C

DELETE FROM table_name;

Additional Explanation

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

Verified

Option D

UPDATE table_name SET status='active';

Additional Explanation

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