> For the complete documentation index, see [llms.txt](https://gyansetu-sql.gitbook.io/sql-programming/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gyansetu-sql.gitbook.io/sql-programming/sql-database.md).

# Data Definition Language

**DDL(Data Definition Language) :** DDL or Data Definition Language actually consists of the SQL commands that can be used to define the database schema. It simply deals with descriptions of the database schema and is used to create and modify the structure of database objects in database.

**Examples of DDL commands:**

* **CREATE** – is used to create the database or its objects (like table, index, function, views, store procedure and triggers).
* **DROP** – is used to delete objects from the database.
* **ALTER**-is used to alter the structure of the database.
* **TRUNCATE**–is used to remove all records from a table, including all spaces allocated for the records are removed.
* **COMMENT** –is used to add comments to the data dictionary.
* **RENAME** –is used to rename an object existing in the database.


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