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. 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. 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.
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