Welcome to Part 20 of the Database Systems series! Now that we know how to create databases and tables, what happens when we need to change them or get rid of them entirely?
In this lecture, we dive into the final phase of the Data Definition Language (DDL) lifecycle. We explore how to modify existing structures, safely remove objects, and quickly wipe data using SQL Server Management Studio (SSMS) and T-SQL.
📌 In this video, you will learn:
ALTER TABLE: How to add, remove, or change columns in a table that already exists.
DROP TABLE & DATABASE: The permanent destruction of database objects and how to safely execute it.
TRUNCATE TABLE: How it differs from the DELETE command and why it is the fastest way to wipe a table clean.
The "In Use" Error: How to force-drop a database when SQL Server tells you it is currently in use.
