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 DATA DEFINITION LANGUAGE

Data Definition Language (DDL) is a set of SQL commands that are used to define and manage the structure of a database. These commands are used to create, modify, and delete database objects such as tables, views, indexes, and constraints.

The DDL commands are used to define the schema of a database, which specifies the logical and physical structure of the database. The schema includes information about the tables, columns, data types, relationships, constraints, and other database objects.

Some examples of DDL commands include CREATE, ALTER, and DROP. The CREATE command is used to create a new database object, such as a table or view. The ALTER command is used to modify the structure of an existing object, such as adding or removing a column. The DROP command is used to delete an object from the database.

DDL commands are typically used by database administrators, developers, and other technical users who are responsible for designing, building, and maintaining databases. Understanding DDL is essential for working with databases and ensuring that the structure and integrity of the data are maintained.