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Recursive Queries in PostgreSQL

Introduction
Quiz
8. Nested CTEs with a subquery
Summary

Instruction

Nice! How about another nested CTE, this time with a subquery?

Exercise

First, count the number of employees for every project with a total number of hours_spent that's higher than 20. Then, find the average number of such employees for a given client. Finally, show the maximal_average alongside the client_id to which the maximal average applies.