How to Use CTEs in SQL (with real examples)

📰 Medium · Programming

Learn to use Common Table Expressions (CTEs) in SQL to simplify complex queries and improve readability

intermediate Published 19 Apr 2026

Action Steps

Write a SQL query using a nested subquery
Replace the nested subquery with a CTE to improve readability
Use the CTE to simplify a complex query with multiple joins
Test the CTE query with sample data to verify results
Optimize the CTE query for better performance

Who Needs to Know This

SQL developers and data analysts can benefit from using CTEs to write more efficient and maintainable code, making it easier for team members to understand and collaborate on queries

Key Insight

💡 CTEs can greatly improve SQL query readability and maintainability