Basic Join

Ollivander's_Inventory.sql

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+select W.id, WP.age, W.coins_needed, W.power from Wands W
+inner join Wands_Property WP on WP.code = W.code
+where WP.is_evil = 0 and w.coins_needed = 
+    (select min(coins_needed) from Wands W1 
+     join Wands_Property WP1 on (W1.code = WP1.code) 
+     where W1.power = W.power and WP1.age = WP.age) 
+order by W.power desc, WP.age desc;