> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/architecture/server-constraints/server-constraints-overview.md).

# Server Constraints Overview

MariaDB Enterprise Server provides DDL (Data Definition Language) syntax to `create, alter, or drop` constraints.

In the context of `ISO 9075-2:2016`, this page uses "DDL (Data Definition Language)" to refer to SQL statements in the standard's "SQL-schema statements" group.

<sub>*This page is: Copyright © 2025 MariaDB. All rights reserved.*</sub>

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