Completed Sql6

[Paneripatel]

No description provided.

[super30admin]

1. Correctness:

   • CombineTwoTables.sql: Correctly uses LEFT JOIN to include all persons even if they don't have an address.
   • CustomersWithStrictlyIncreasingPurchases.sql: The logic appears correct for finding customers with strictly increasing purchases year over year.
   • GamePlayAnalysisII.sql: Correctly finds the first login device for each player.
   • GamePlayAnalysisIII.sql: Correctly calculates running total of games played.
   • ShortestDistanceInAPlane.sql: Correctly calculates the shortest distance between any two points.

2. Time Complexity:

   • CombineTwoTables.sql: O(n) for the join operation.
   • CustomersWithStrictlyIncreasingPurchases.sql: O(n^2) due to the self-join.
   • GamePlayAnalysisII.sql: O(n log n) for the GROUP BY and subquery.
   • GamePlayAnalysisIII.sql: O(n log n) for the window function.
   • ShortestDistanceInAPlane.sql: O(n^2) due to the Cartesian product.

3. Space Complexity:

   • All solutions have reasonable space complexity proportional to their input sizes.

4. Code Quality:

   • Overall good structure and readability.
   • Consistent formatting and use of aliases.
   • Could improve with comments explaining complex logic (especially in CustomersWithStrictlyIncreasingPurchases.sql).
   • The HAVING clause in CustomersWithStrictlyIncreasingPurchases.sql could be more clearly explained.

5. Efficiency:

   • CustomersWithStrictlyIncreasingPurchases.sql could potentially be optimized with a different approach to avoid the self-join.
   • ShortestDistanceInAPlane.sql could use a more efficient algorithm than brute-force comparison of all pairs.