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. Jan 13, 2026 · Data Definition Language (DDL) is a subset of SQL used in a DBMS (Database Management System) to define and manage the structure of database objects such as tables. It controls how data is organized and stored in the database. Includes commands like CREATE, ALTER, TRUNCATE, and DROP. 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. The syntax for ALTER TABLE is different for disk-based tables and memory-optimized tables.
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