Data Types in PostgreSQL: Domain Data Types || PostgreSQL Full Playlist #57

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Learn PostgreSQL Domain Data Types with examples, constraints, and OID types for cleaner, safer database design.

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Description
In this video, we explore Domain Data Types in PostgreSQL — a powerful feature that lets you create custom, reusable data types with built-in constraints. This helps you enforce consistent rules across your database while keeping your schema clean and maintainable.

We’ll start with the basics of domains, showing how to build them from existing types and add CHECK constraints for validations. You’ll see examples like restricting integers to positive values or phone numbers to a specific pattern. We’ll also cover advanced domains using ENUMs and arrays.

Next, we’ll dive into Object Identifier (OID) Types such as regclass, regtype, and others. These special types simplify working with PostgreSQL’s internal system objects, making queries cleaner and more robust. You’ll learn how to use OIDs in system queries, pg_relation_size, and nextval() calls.

By the end of this tutorial, you’ll be able to:
Create and use Domain Types with constraints
Work with OID types and their aliases
Apply domains to different data types, including arrays and enums
Understand when to use early vs late binding in PostgreSQL

📌 Watch this if you want to:
✔ Make your database design more robust
✔ Avoid repeating constraints in multiple tables
✔ Use PostgreSQL’s built-in features to simplify queries

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📌 Chapters Covered:
00:00 - Introduction
00:18 - Create Custom Domain
01:16 - Casting Operations on Domain Type
02:05 - Domain over ENUM
03:21 - Conclusion