PostgreSQL DBA – Part 3: Mastering PK, FK, UK and Referential Integrity

In Part 3 of the PostgreSQL DBA series, we focus on the core mechanisms that guarantee data integrity in production databases: Primary Keys, Foreign Keys, Unique constraints, and NOT NULL constraints.

Constraints are not optional features. They define how data behaves, how systems scale, and how safely applications evolve over time. Poorly designed constraints are a common root cause of data inconsistencies and operational issues in production environments.

🔥 In this video, you will learn:
– how to design effective Primary Keys (PK)
– how to use Unique constraints (UK) to enforce business rules
– why NOT NULL constraints are essential for data quality
– how Foreign Keys (FK) ensure referential integrity
– the real impact of CASCADE vs RESTRICT during updates and deletions

🎯 This content is intended for developers, database engineers, and aspiring PostgreSQL DBAs who want to build robust, scalable, and production-ready database schemas.

This series is based on real-world DBA experience, not academic theory.

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Видео PostgreSQL DBA – Part 3: Mastering PK, FK, UK and Referential Integrity канала DB Engineering & Code – EN