588. Salary difference from department average — window challenge 1

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

Write the MySQL 8.0 query using a window function. Handle ties and partitioning deliberately where applicable.

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Answer & Explanation

4 Answers

Verified Correct Answer

Option A

SELECT id,name,dept_id,salary,salary-AVG(salary) OVER(PARTITION BY dept_id) AS diff FROM employees;

Additional Explanation

Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.

Verified

Option B

Use CROSS JOIN to create the ranking.

Additional Explanation

This option is incorrect for the stated requirement.

Verified

Option C

Use GROUP BY only and return an equivalent row-level ranking without a subquery.

Additional Explanation

This option is incorrect for the stated requirement.

Verified

Option D

Use DELETE instead of a window query.

Additional Explanation

This option is incorrect for the stated requirement.