588. Salary difference from department average — window challenge 1

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

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.
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Editorial Answer 1
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Option B

Use CROSS JOIN to create the ranking.
Additional Explanation
This option is incorrect for the stated requirement.
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Editorial Answer 2
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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.
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Editorial Answer 3
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Option D

Use DELETE instead of a window query.
Additional Explanation
This option is incorrect for the stated requirement.
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Editorial Answer 4