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.

This tutorial shows you how to use SQL Server ALTER TABLE ADD column statement to add one or more columns to a table.

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.

ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.

Jun 6, 2025 · Learn how to use Alter Table to Add Column in SQL Server with this article that shows several scenarios of adding a column to existing table.

In Object explorer, right-click the table to which you want to add new columns and choose Design. Click the first blank cell under the last column name column and enter the name of the column, as shown …

Jul 23, 2025 · Sometimes it might happen that at the time of table creation, we forget to add some columns to our table. We resolve this problem by using ALTER TABLE ADD command, which allows …

3 days ago · Step by step guide - sql server: alter table add column with real examples, syntax, and best practices to update tables safely.

Nov 18, 2025 · Specifies the properties of a PRIMARY KEY, FOREIGN KEY, UNIQUE, or CHECK constraint that is part of a new column definition added to a table by using ALTER TABLE.

The ALTER TABLE command adds, deletes, or modifies columns in a table. The ALTER TABLE command also adds and deletes various constraints in a table. The following SQL adds an "Email" …