Create ollivander_inventory.sql

Author: erjan

hackerrank_sql_practice/ollivander_inventory.sql

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+/*
+shitty problem - bad description!
+
+Harry Potter and his friends are at Ollivander's with Ron, finally replacing Charlie's old broken wand.
+
+Hermione decides the best way to choose is by determining the minimum number 
+of gold galleons needed to buy each non-evil wand of high power and age. Write a query 
+to print the id, age, coins_needed, and power of the wands 
+that Ron's interested in, sorted in order of descending power. If more than 
+one wand has same power, sort the result in order of descending age.
+*/
+
+
+select w1.id, w2.age, w1.coins_needed, w1.power 
+from wands w1 inner join wands_property w2 on w1.code = w2.code
+where w2.is_evil = 0 and w1.coins_needed = (select min(coins_needed) from 
+wands ws inner join wands_property wp on ws.code = wp.code where w2.age = wp.age and w1.power = ws.power)
+
+order by  w1.power desc, w2.age desc