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RENAME – Renames an existing object in the database. TRUNCATE – Used to remove all records from a table, including all spaces allocated for the records are removed.ĬOMMENT – Adds comments to the data dictionary. Following DDL commands are commonly used while working with database schema.ĬREATE - Used to create the database or its objects (like table, index, function, views, store procedure and triggers).ĭROP – Used to delete objects from the database.ĪLTER - Used to alter the structure of the database. DDL commandsĪ single DDL file can contain several commands that, owing to correct syntax, will execute in sequence and make changes to the schema such as creating character sets and tables, dropping tables, renaming and altering tables.

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Popular applications that can create and open DDL files are Windows Text Editor, Jetbrains Intellij Idea, and EclipseLink. A database schema is owned by its created and all the CRUD operations can be performed on it.

Commands in a DDL file are written in SQL and can perform operations such as create table in database, drop and update. It contains statements/commands for working with database structures such as tables, columns, records, and other fields. ddl extension is a Data Definition Language file that is used to define the schema of a database.