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In this video tutorial, part 44 of the SQL for Beginners series, the instructor explains the use of the ALTER statement in SQL. Key topics covered include the ADD keyword for adding new columns, the MODIFY COLUMN keyword for changing existing column details, the RENAME COLUMN keyword for renaming columns, and the DROP COLUMN keyword for removing columns. The session includes a practical demonstration with an example table named "employ" that initially has three columns: ID, name, and experience. The tutorial aims to guide viewers through these SQL commands effectively, showcasing their application in modifying table structures.