This is a classic interview question asked during Facebook SQL rounds. It’s very common to get questions that have “percentage” style calculations so you should brush up on this!
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Answer:
Part 1 (Business Problem Formulation): https://www.youtube.com/watch?v=bktLkPzWVoY
Part 2 (SQL): https://www.youtube.com/watch?v=LcVz8wSM-AM
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