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title: "Statements | Microsoft Docs"
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# Transact-SQL statements
[!INCLUDE[tsql-appliesto-ss2008-asdb-asdw-pdw-_md](../../includes/tsql-appliesto-ss2008-asdb-asdw-pdw-md.md)]

This reference topic summarizes the categories of statements for use with Transact-SQL (T-SQL). You can find all of the statements listed in the left-hand navigation.

## Backup and restore
The backup and restore statements provide ways to create backups and restore from backups.  For more information, see the [Backup and restore overview](../../relational-databases/backup-restore/back-up-and-restore-of-sql-server-databases.md).

## Data Definition Language
Data Definition Language (DDL) statements defines data structures. Use these statements to create, alter, or drop data structures in a database.
- ALTER
- Collations
- CREATE
- DROP
- DISABLE TRIGGER
- ENABLE TRIGGER
- RENAME
- UPDATE STATISTICS

## Data Manipulation Language
Data Manipulation Language (DML) affect the information stored in the database. Use these statements to insert, update, and change the rows in the database.

- BULK INSERT
- DELETE
- INSERT
- MERGE
- TRUNCATE TABLE

## Permissions statements
Permissions statements determine which users and logins can access data and perform operations. For more information about authentication and access, see the [Security center](../../relational-databases/security/security-center-for-sql-server-database-engine-and-azure-sql-database.md).

## Service Broker statements
Service Broker is a feature that provides native support for messaging and queuing applications. For more information, see [Service Broker](../../relational-databases/service-broker/event-notifications.md).

## Session settings
SET statements determine how the current session handles run time settings. For an overview, see [SET statements](set-statements-transact-sql.md).