Ollivanders Inventory Answer

In the context of a magical world, wands are essential tools for wizards. Each wand has certain properties like power, age, and cost. However, not all wands are good; some are evil. The problem here is to find the least expensive non-evil wands for each combination of power and age, and sort the result by power and age in descending order.

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Here is the Ollivanders Inventory Answer HackerRank solution using CodeRankGPT:

The solution uses a SQL SELECT statement to retrieve the desired data. It joins the 'wands' table with the 'wands_property' table based on the 'code' field. It then filters out the evil wands using a WHERE clause. To find the least expensive wand for each power and age combination, it uses a subquery in the WHERE clause that returns the minimum 'coins_needed' for each 'power' and 'age' combination. Finally, it sorts the result by 'power' and 'age' in descending order using the ORDER BY clause.


SELECT a.id, 
       b.age, 
       a.coins_needed, 
       a.power 
FROM   wands a 
       JOIN wands_property b 
         ON a.code = b.code 
WHERE  b.is_evil = 0 
       AND a.coins_needed = (SELECT Min(a1.coins_needed) 
                             FROM   wands a1 
                                    JOIN wands_property b1 
                                      ON a1.code = b1.code 
                             WHERE  b.age = b1.age 
                                    AND a.power = a1.power) 
ORDER  BY a.power DESC, 
          b.age DESC;

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