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SQL/MED
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<p>The SQL/MED ("Management of External Data") extension to the <a href="/facts/SQL/UjQLJcYm">SQL</a> standard is defined by <a href="/facts/International_Organization_for_Standardization/IacYR7Yg">ISO</a>/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 <a href="/facts/Data/AUBFN97o">data</a>. External data is data that is accessible to, but not managed by, an SQL-based <a href="/facts/DBMS/VYcpkevb">DBMS</a>. This standard can be used in the development of <a href="/facts/Federated_database_system/SSFWzg6k">federated database systems</a>. </p>