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select id, age, coins_needed, power
from
(
select id, age, coins_needed, power,
min(coins_needed) over(partition by age, power order by coins_needed) as min_coins
from
wands w
inner join
wands_property w_p
on w.code=w_p.code
where is_evil=0
)a
where coins_needed - min_coins=0
order by power desc, age desc
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Ollivander's Inventory
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An alternate yet similar methodology:
select id, age, coins_needed, power from (
select id, age, coins_needed, power,
min(coins_needed) over(partition by age, power order by coins_needed) as min_coins from wands w inner join wands_property w_p on w.code=w_p.code where is_evil=0 )a where coins_needed - min_coins=0 order by power desc, age desc