solution to problem 1, 3

[avishwak]

No description provided.

[super30admin]

The student's solution is completely empty, which means it fails to address the problem in any way. Without any code, we cannot evaluate correctness, time complexity, space complexity, code quality, or efficiency.

For a medium difficulty SQL problem, the student should at least attempt to:

1. Understand the problem requirements (though they're not provided here)
2. Write SQL queries that would solve the typical problems in this category (likely involving joins, subqueries, or window functions)
3. Consider edge cases like NULL values, duplicate records, or performance with large datasets

To improve, the student should:

1. First ensure they understand the problem statement
2. Attempt to write a basic solution even if incomplete
3. Test their solution with sample data
4. Refine their approach based on any errors or performance issues