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Challenge 2: Sum of Plays per Country + Genre (Trivial)

Challenge 2: Sum of Plays per Country + Genre (Trivial)

In this challenge, you'll be asked to get the sum of plays grouped by both country and genre.

Problem definition

Your music analyst has realized that it’s unfair to view the total number of plays per country without counting in the effect of genres. Can you return the total number of plays per each ...