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SQL • LESSON 20

JOIN Multiple Tables

How do we join three or more relational tables in a single normalized query?

Advanced3 Minutes370 XP
🤔 THE QUESTION

How do we join three or more relational tables in a single normalized query?

💡 WHAT IS IT?

Chaining multiple JOIN clauses connects dimensional star-schema and normalized tables.

🎯 WHAT IS IT USED FOR?

Building enterprise reporting pipelines combining facts, dimensions, and lookup tables.

💻 EXAMPLE
SELECT employees.name,
departments.department_name,
locations.city
FROM employees
INNER JOIN departments
ON employees.department_id = departments.id
INNER JOIN locations
ON departments.location_id = locations.id;

🎯 Mission Objectives

Practice typing production-grade SQL code for JOIN Multiple Tables.

  • Multi-table JOIN
  • Star Schema
  • Relational chaining
  • ON predicates