Refactoring with CTEs

Problem

You inherited a massive, nested 3-level deep subquery from a former analyst. Your manager wants you to make it readable. Write a query that outputs concept with the value: "CTEs (Common Table Expressions) make complex queries more readable by breaking them into logical, temporary result sets using the WITH keyword."

Database Schema

This problem acts as a scratchpad. You will write your own DDL/DML or conceptual queries, so there is no predefined schema.

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Solution