PostgreSQL ALTER TABLE Tutorial: Add Constraints, Modify Columns, DROP Commands — Complete Guide
Welcome to today's PostgreSQL advanced session!
In this video, we explore one of the most powerful SQL features used in real-time database management — ALTER TABLE.
You will learn how to safely modify table structures and work with all major constraints.
Topics Covered:
What is ALTER TABLE
Add a new column
Modify or rename a column
Add constraints:
Primary Key
Foreign Key
Unique
Not Null
Check
Drop constraints
Drop columns
Rename tables
Real-time examples used in backend applications
By the end of this session, you will be able to design and manage database structures like a professional SQL developer.
Useful for:
✔ Data Engineers
✔ Backend Developers
✔ Database Administrators
✔ Students preparing for interviews
✔ Anyone learning PostgreSQL
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