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Introduction
Nested CTEs
Summary

Instruction

Excellent! Let's do one more exercise of this kind.

Exercise

Count the maximal amount_earned on a given day in a given city. Then, calculate the average maximal amount across all cities on a given day. Finally, count the number of days on which that average maximal exceeded $1700.

Stuck? Here's a hint!

Use MAX(amount_earned) in the first CTE, the use AVG on that aggregate result. In the outer query, use COUNT.