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. 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. Jul 23, 2025 · A Table in a database is part of the database schema and the 'ALTER TABLE Moify Column' command is used to make changes to the database table column data type, column size, and if the column can accept NULL or NOT NULL value.
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