PostgreSQL ON CONFLICT: Mastering UPSERT and Conflict Resolution

When inserting data into a database, encountering duplicate key violations can disrupt your application's flow and slow down performance. Instead of running slow, separate queries to check for existing records before every insert, you can handle conflicts instantly at the database level. This course guides you through the foundational and modern techniques of using the PostgreSQL ON CONFLICT clause, commonly known as UPSERT. You will learn to write clean, performant, and resilient SQL queries that gracefully insert new data or update existing records in a single database round-trip. What you'll learn: - Understand the fundamental concepts of database conflicts, unique constraints, and the need for atomic UPSERT operations. - Implement ON CONFLICT DO NOTHING to safely ignore duplicate inserts without throwing errors. - Apply ON CONFLICT DO UPDATE to modify existing rows dynamically using the excluded table alias. - Configure partial unique indexes and target specific constraints for precise conflict resolution. - Analyze modern performance best practices for bulk UPSERT operations and high-concurrency environments. You will start with the essential theory of constraints and indexes, then progress through step-by-step written explanations of basic and advanced conflict-handling syntax. Through practical SQL examples and conceptual exercises, you will learn to structure queries that safeguard your data integrity. This course is designed for beginner backend developers, database administrators, and data analysts who have a basic understanding of SQL and want to write more efficient database queries. No advanced database experience is required. Step up your database development skills and start writing robust PostgreSQL queries today.