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FAQ: Common Metrics - ARPU 2

This community-built FAQ covers the “ARPU 2” exercise from the lesson “Common Metrics”.

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This exercise can be found in the following Codecademy content:

SQL: Analyzing Business Metrics

FAQs on the exercise ARPU 2

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Question about the join statement: suppose there are days where gameplays occur, but no purchases occur. My initial though was to use a left join of daily_revenue into daily_players on date. Given this use case, would this make more sense instead of the inner join used in the exercise?

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Why doesn’t this code work, in the same way as using the with clause?

select date(created_at), (round(sum(price), 2) / count(distinct user_id))
from purchases join gameplays on date(created_at)
group by 1
order by 1;

Couldn’t this be done with a simple inner join on created_at?