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:
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Create and use Domain Types with constraints
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Work with OID types and their aliases
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Apply domains to different data types, including arrays and enums
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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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