Subquery vs. CTE vs. Joins

In this lesson, we'll explore three fundamental ways to combine and structure data in PostgreSQL: Subqueries, Common Table Expressions (CTEs), and Joins.

Understanding their differences and optimal use cases is key to writing efficient and readable SQL.

You're already familiar with JOINs! They are the primary way to combine rows from two or more tables based on a related column between them.

• Purpose: Link related data across tables.
• Readability: Often straightforward for direct relationships.
• Performance: Highly optimized by PostgreSQL for combining large datasets.