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  1. Prepare
  2. SQL
  3. Basic Join
  4. Ollivander's Inventory
  5. Discussions

Ollivander's Inventory

  • achalshah20
     + 2 comments

    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