SQL4 submitted

[PranathiDeepak]

No description provided.

[super30admin]

1. Problem1.sql:

   • Correctness: The solution correctly handles the problem of counting accepted candidates within budget constraints, separating senior and junior candidates. The logic for calculating remaining budget for juniors is sound.
   • Time Complexity: O(n log n) due to the window function sorting.
   • Space Complexity: O(n) for storing the CTE.
   • Code Quality: Well-structured with clear CTE usage. Could improve by adding comments explaining the logic.
   • Efficiency: Good use of window functions. No major optimizations needed.

2. Problem2.sql:

   • Correctness: Correctly calculates team statistics by handling both home and away matches through UNION ALL. Handles tie-breakers properly.
   • Time Complexity: O(n) for the CTE creation and O(n log n) for the final sorting.
   • Space Complexity: O(n) for storing the CTE.
   • Code Quality: Good structure but could benefit from formatting the CASE statement more clearly. Column aliases could be more descriptive.
   • Efficiency: Efficient approach by processing both home and away matches in one pass.

3. Problem3.sql:

   • Correctness: Correctly identifies salespersons who didn't deal with RED company using NOT IN with a subquery.
   • Time Complexity: O(n) for the subquery and O(n) for the main query.
   • Space Complexity: O(n) for storing intermediate results.
   • Code Quality: Simple and clear. Could consider using NOT EXISTS instead of NOT IN for potentially better performance.
   • Efficiency: While correct, NOT EXISTS might be more efficient with large datasets.

4. Problem4.sql:

   • Correctness: Correctly finds the person with most friends by counting both requester and accepter roles.
   • Time Complexity: O(n) for the CTE and O(n log n) for the grouping and sorting.
   • Space Complexity: O(n) for storing the CTE.
   • Code Quality: Clean and concise. Could add a comment explaining the UNION ALL approach.
   • Efficiency: Efficient solution using UNION ALL to combine both roles.

General improvements:

• Add comments to explain complex logic
• Consider consistent formatting (especially for CASE statements)
• For Problem3, consider using NOT EXISTS instead of NOT IN
• Column aliases could be more descriptive in some cases