Linking to external databases and servers in SQL Server

In order to select tables in a stored procedure, view or trigger in an external database you must use the fully qualified name in the select statement.

For example, to select from a table in a separate database on the same SQL Server instance you might write:


SELECT     AuthorID, Author
FROM         BooksDb.dbo.PIC_Author

You can also select cross-databases by adding the server name:


SELECT     AuthorID, Author
FROM         Server2.BooksDb.dbo.PIC_Author

Until this morning the SQL Statement above had always worked for me, but this morning using a new server (running SQL2008) I received the following error message:


---------------------------
Microsoft SQL Server Management Studio
---------------------------
SQL Execution Error.

Executed SQL statement: SELECT AuthorID, Author FROM Server2.BooksDb.dbo.PIC_Author
Error Source: .Net SqlClient Data Provider
Error Message: Could not find server 'Server2' in sys.servers. Verify that the correct server name was specified. If necessary, execute the stored procedure sp_addlinkedserver to add the server to sys.servers.
---------------------------
OK   Help

I’d never seen this error before and found this article (http://msdn.microsoft.com/en-us/library/aa259589(SQL.80).aspx) explaining how to use sp_addlinkedserver.

So I executed the following on the SQL Server 2008 box:


USE master
GO
EXEC sp_addlinkedserver
   'Server2'
GO

And afterward the former SQL expression “SELECT AuthorID, Author FROM Server2.BooksDb.dbo…” executed successfully.

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