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. Mar 23, 2026 · It helps update database tables efficiently as requirements change while preserving existing data. It allows developers to add, modify, or delete columns and constraints as needed. This SQL tutorial explains how to use the SQL ALTER TABLE statement to add a column, modify a column, drop a column, rename a column or rename a table (with lots of clear, concise examples). It is used to add, modify, or drop/delete columns in a table.
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