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SQL ALTER TABLE Statement. 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.
A SQL Server example for changing, adding, and removing columns for an existing table
This SQL Server tutorial explains how to use the ALTER TABLE statement in SQL Server (Transact-SQL) to add a column, modify a column, drop a column, rename a column or rename a table with syntax and examples.
In this tutorial, you will learn how to use the SQL Server ALTER TABLE ALTER COLUMN statement to modify a column of a table.
In SQL, the ALTER TABLE command is used to modify the structure of an existing table. In this tutorial, you will learn about the SQL ALTER TABLE statement with the help of examples.
19 Σεπ 2022 · In this article, we look at how to make changes to SQL Server table structures using T-SQL commands to add, delete and change columns in a table.
