Completed MockSQL3

[kaaviyavarrshini]

No description provided.

[super30admin]

For Problem1_TournamentWinners.sql:

1. Correctness: The solution appears to correctly calculate the total scores for each player and then determine the winner for each group based on the highest score. The use of dense_rank() ensures proper handling of ties.
2. Time Complexity: The solution involves multiple operations (UNION ALL, GROUP BY, JOIN, and window function) which would typically result in O(n log n) time complexity.
3. Space Complexity: The CTE creates temporary storage for player scores, resulting in O(n) space complexity.
4. Code Quality: The code is well-structured and readable. The use of CTEs improves clarity. One improvement could be to add comments explaining the purpose of each step.
5. Efficiency: The solution is efficient, but could potentially be optimized by combining some operations or using more specific joins.

For Problem2_MarketAnalysis2.sql:

1. Correctness: The solution correctly identifies the second item ordered by each seller and checks if it matches their favorite brand. However, there's a syntax error with the column alias '2nd_item_fav_brand' (should not start with a number).
2. Time Complexity: The solution uses window functions and joins, resulting in O(n log n) time complexity.
3. Space Complexity: The CTE creates temporary storage, resulting in O(n) space complexity.
4. Code Quality: The code is generally well-structured but could benefit from better formatting (consistent indentation) and comments. The column alias issue should be fixed.
5. Efficiency: The solution is efficient, but the ORDER BY in the CTE is unnecessary since the window function already handles ordering.

General improvements:

1. Add comments to explain complex logic
2. Fix column naming conventions (avoid starting with numbers)
3. Remove unnecessary ORDER BY clauses
4. Consider adding handling for edge cases (e.g., players with no matches in Problem 1)