Constraints for MariaDB Xpand

This page is part of MariaDB's Documentation.

The parent of this page is: Constraints

Topics on this page:

• Overview

• Compatibility

• Constraints

Overview

MariaDB Xpand provides DDL (Data Definition Language) syntax to create, alter, or drop constraints:

• Xpand performs many DDL operations as online schema changes, which allows concurrent reads and writes during the operation

• Xpand's DDL syntax is very similar to the DDL syntax of MariaDB Enterprise Server and MySQL 5.7

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.