Web Reference: Nov 18, 2025 · Learn how to add columns to an existing table in SQL Server and Azure SQL platforms by using SQL Server Management Studio or Transact-SQL. The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table. This tutorial shows you how to use the SQL ALTER TABLE ... ADD COLUMN statement to add one or more columns to an existing table.
YouTube Excerpt: The SQL Tutorial video includes the following 00:00:00 Introduction to How to
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