SQL ALTER & DROP Commands: Modify Tables

Managing data often means changing your table structures as your project grows. In this tutorial, we focus on the essential ALTER and DROP commands in SQL to help you modify databases dynamically. We cover everything from adding new columns for additional data points to deleting unnecessary columns and modifying existing data types for better performance. What you will learn: ALTER TABLE ADD: How to insert new columns (like Location) into an existing table. ALTER TABLE DROP: The command to permanently delete columns you no longer need. ALTER COLUMN: How to change data types (e.g., from NVARCHAR to VARCHAR) without recreating the table. SELECT Statements: Using wildcards (*) to view all data or selecting specific columns for precise reporting. Code used in this video: -- Adding a new column ALTER TABLE Customers ADD Location VARCHAR(30); -- Deleting a column ALTER TABLE Customers DROP COLUMN Location; -- Modifying a data type ALTER TABLE Customers ALTER COLUMN EmailAddress VARCHAR(50); -- Querying data SELECT * FROM Customers; SELECT Customer_id, FirstName FROM Customers; Mastering these commands is key to maintaining a clean and efficient database. If this helped you, Like the video and Subscribe to Mohammad Yusuf for more SQL deep dives! #SQLTutorial #DatabaseManagement #DataAnalytics #SQLCommands #LearnToCode #CodingTips