Chapter 4: Joins

Inner, outer, cross, self joins, join keys, duplication, and cardinality.

Purpose

This page is a chapter placeholder aligned with the book structure in cloud-data-engineering-book-structure.md. Expand it into the final lesson, examples, exercises, and project references for this chapter.

Working Outline

• Core concepts
• Practical examples
• Common pitfalls
• Hands-on exercises
• Production context