The SQL/MED ("Management of External Data") extension to the SQL standard is defined by ISO/IEC 9075-9:2008 (originally defined for SQL:2003). SQL/MED provides extensions to SQL that define foreign-data wrappers and datalink types to allow SQL to manage external data. External data is data that is accessible to, but not managed by, an SQL-based DBMS. This standard can be used in the development of federated database systems.
- PostgreSQL has support for some SQL/MED since version 9.1. 9.2 supports more.
- LucidDB has support for SQL/MED.
- MariaDB has support for SQL/MED with the CONNECT storage engine. The implementation uses different syntax than the official standard.
- Farrago has support for SQL/MED.
- IBM DB2 has support for SQL/MED.
- Teiid has support for SQL/MED. 
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