Oracle provides a "link" mechanism in order to access a different database instance than the one on which the query is running.


Is there any ANSI SQL standard way to code this?

  • You're talking about Oracle DB links? Good question by the way. But i don't think that it has an ANSI similar command, cause it's based on Oracle TNS ...
    – AndreDuarte
    Sep 23, 2014 at 20:27
  • Yes, referring to Oracle DB links. I found that it can refer to other database types if Oracle Heterogeneous Services is used. Is there any way to accomplish an equivalent using ANSI SQL standard?
    – Paul
    Sep 24, 2014 at 15:34

1 Answer 1


SQL/MED (Management of External Data) is an extension to SQL standard defined by ISO/IEC 9075-9:2008. SQL/MED foreign-data wrappers can be used to refer to external RDBMS and non-RDBMS data sources.

While I don't think Oracle or MS SQL Server support SQL/MED, DB2 and PostgreSQL are supporting SQL/MED.

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