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hi, i am wondering what this line does:
where s.score = d.score and c.difficulty_level = d.difficulty_level
if we are using inner join, why do we have to be sure that the score matches and the difficulty level matches across the join? thanks!
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hi, i am wondering what this line does: where s.score = d.score and c.difficulty_level = d.difficulty_level if we are using inner join, why do we have to be sure that the score matches and the difficulty level matches across the join? thanks!