solution to both problems

[avishwak]

No description provided.

[super30admin]

For Problem 1 (Market Analysis II):
Strengths:

• The solution correctly uses a CTE to identify the second item sold by each seller.
• The CASE statement properly handles the comparison between the item brand and favorite brand.
• The LEFT JOIN ensures all users are included in the results.

Areas for Improvement:

• The subquery could be simplified by moving the RANK() directly into the CTE without an additional nested query.
• The column alias '2nd_item_fav_brand' should use standard SQL quoting (either double quotes or square brackets) for better compatibility.
• Consider adding comments to explain the logic, especially for the ranking part.

For Problem 2 (Tournament Winners):
Strengths:

• Good use of UNION ALL to combine scores from both player positions.
• Proper grouping and ranking logic to determine winners.
• Correct handling of tie-breakers with player_id.

Areas for Improvement:

• The solution could be more efficient by calculating scores directly in the first CTE without a subquery.
• The column names in the final SELECT could be more descriptive (e.g., 'winner_id' instead of 'player_id').
• Consider adding a comment explaining the tie-breaker logic.

General Observations:

• Both solutions are logically correct and solve the problems effectively.
• The code is well-structured but could benefit from more consistent formatting (e.g., indentation).
• The solutions follow SQL best practices but could be slightly more optimized.
• Edge cases (like users with no sales or matches with null scores) appear to be handled correctly.