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There can be multiple wands of the same power and age but of different cost.
Yes, but the problem never mentioned to look for the minimum among the different combinations of power and age. It is ill-posed.
Finally I know why my code doesn't work... Thank you.
Can you (or someone else) help me?
I understand the question i.e for each combination of age and power you need to find the wand with minimum cost that is not evil.
I came up with this:
SELECT MIN(w.coins_needed),w.power,wp.age from wands w
inner join wands_property wp
on w.code= wp.code
group by w.power,wp.age
order by w.power desc, wp.age desc;
The solution requires me to add ID of the wand and I am struggling with the same.
Any Idea how to get the ID infront of my solution