Web Reference: Aug 8, 2025 · In SQL, the CREATE and ALTER commands are part of the Data Definition Language (DDL). These commands help define and modify the structure of your database objects like tables, columns, constraints and indexes without affecting the actual data inside. Dec 27, 2024 · Use CREATE OR ALTER statement in SQL Server to create an object if it does not already exist or alter an object if it does exist. 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.
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