Learn how to transform complex, hard-to-maintain SQL queries into clean, structured, and readable queries using Common Table Expressions (CTEs). This practical guide walks through a step-by-step approach to identifying logical query stages, separating them into meaningful CTEs, preserving existing business logic, avoiding common pitfalls such as join multiplication, and validating the final result. Whether you’re working with reporting queries, analytical workloads, or complex multi-table transformations, this guide provides a reusable method for refactoring SQL with confidence.
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