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Referencing a table in database A from database B

How do I reference a table from database "A" from database "B"?

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This is not really a SQL-specific issue; the answer depends on your particular database vendor. For example, with Oracle, you would create a DATABASE LINK in database "B" like this:

CREATE DATABASE LINK "A" 
  CONNECT TO CURRENT_USER 
  USING 'DB_A';
Then, from database "B," you would simply refer to a table in database "A" like this:
SELECT * 
  FROM MyTable@A;
In SQL Server, you would access a remote table this way:
SELECT *
  FROM [Server].[Database].[Owner].[Table];
This is definitely a place where I recommend reviewing your vendor specific documentation.

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This was first published in February 2002

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