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.
Implementations PostgreSQL has support for some SQL/MED since version 9.1.PostgreSQL Wiki: SQL/MEDChapter 5.12, "Foreign Data" of the PostgreSQL Guide. LucidDB has support for SQL/MED.LucidDB Architecture MariaDB has support for SQL/MED with the CONNECT storage engine.CONNECT storage engine The implementation uses different syntax than the official standard. Farrago has support for SQL/MED.Farrago SQL/MED Support IBM Db2 has support for SQL/MED.IBM federated database technology Teiid has support for SQL/MED.Teiid Documentation Microsoft SQL Server has internal support for SQL/MED. DATALINK is provided by the FILESTREAMFILESTREAM (SQL Server 2008) and FileTable (SQL Server 2012) functionnalities and external data wrapper by the EXTERNAL TABLEs and PolyBase.EXTERNAL TABLE / PolyBase
See also SQL SQL:2008 SQL:2003
References
External links SQL/MED - A Status Report