Mastering SQL - PostgreSQL: Adding and Modifying Columns with ALTER TABLE

Learn how to use the powerful ALTER TABLE command in PostgreSQL to add, modify, and drop columns in existing tables. This tutorial explains key use cases such as changing column data types, setting default values, adding constraints, and managing sequence-generated columns. Perfect for database developers and administrators looking to enhance their PostgreSQL skills!

You’ll learn:
✔ How to add new columns to existing tables with default values.
✔ Modifying columns (e.g., changing data types or setting default values).
✔ Managing sequences for SERIAL type columns.
✔ Best practices for handling NOT NULL constraints in existing tables.
✔ Practical example: Altering multiple columns in a single ALTER TABLE command.
✔ Viewing and verifying metadata changes using information_schema.

Timestamps
* 0:00 - Introduction to ALTER TABLE in PostgreSQL
* 0:12 - Handling NOT NULL constraints for new columns
* 0:20 - Dropping columns: Precautions and best practices
* 0:36 - Modifying columns: Changing data types and constraints
* 0:53 - Example: Changing user_id column to SERIAL type
* 1:34 - Setting default values for columns
* 2:40 - Example: Changing user_role to CHAR(1) with a default value
* 5:08 - Adding last_updated_ts with CURRENT_TIMESTAMP default
* 6:48 - Performing multiple column operations in a single ALTER TABLE command
* 7:08 - Viewing sequence details and properties

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