Web Reference: Learn how to use the ALTER TABLE statement to add, delete, or modify columns in an existing table. See examples of adding, dropping, renaming, and changing data types of columns in SQL Server, MySQL, and Oracle. Feb 6, 2026 · The SQL ALTER TABLE statement is used to modify an existing table’s structure without deleting it. It helps update the design of a database as requirements change. 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.
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