Web Reference: 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. This article explains SQL DDL commands in Microsoft SQL Server using a few simple examples. Here’s an overview of some common SQL DDL statements: CREATE TABLE. The CREATE TABLE statement is used to create a new table within a database. It specifies the table name, column names, data types, and constraints. Here’s a simple example: employee_id INT PRIMARY KEY, first_name VARCHAR(50), last_name VARCHAR(50), hire_date DATE.
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