Web Reference: 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. 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. Feb 18, 2026 · The basic syntax for adding a column in SQL Server is just two lines. But there are enough edge cases to really throw you off guard if you’re not careful. Your actual code will depend on things like, how you define the column, whether the table already has data, what constraints you need, etc.
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