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Can you please explain how
W.coins_needed = (SELECT MIN(coins_needed) FROM WANDS AS W1 INNER JOIN WANDS_PROPERTY AS P1 ON W1.code = P1.code WHERE W1.power = W.power AND P1.age = P.age)
is different than
group by W.power, W.age having MIN(W.coins_needed)
Thanks
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Ollivander's Inventory
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Can you please explain how
is different than
Thanks