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why are we imposing the condition
c.difficulty_level = d.difficulty_level
in the where clause again? Is this not redundant?
As we are already using this condition in our join.
And can someone explain why the order of joins important? because I tried with exact same solution but different order of joins and I got a wrong answer.
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why are we imposing the condition c.difficulty_level = d.difficulty_level in the where clause again? Is this not redundant? As we are already using this condition in our join. And can someone explain why the order of joins important? because I tried with exact same solution but different order of joins and I got a wrong answer.