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Making a stored proc reads from two databases?

I have a one big database on the SQL Server, and a new small database that I've created recently. I am creating some stored procedures in the new database and in those stored proc I need to join a table from the new db with a table in the old db. I tried to include "USE OLD" with the stored proc but it didn't accept it. IS there a way to do this in SQL? or is there a way around that? any help is appreciated.
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You simply need to qualify the tables with their databases in your query.

SELECT * FROM OLD..Table1 OLD, NEW..Table2 NEW WHERE OLD.Field1 = NEW.Field1

khalAuthor Commented:
It still doesn't accept that, it is saying "invalid object name OLD..Table1". I tried to use FROM OLD..table1
also I tried  FROM OLD.table1 (one dot) but both are not working. Am I doing something wrong?
Try this:

SELECT * FROM OLD.dbo.Table1 OLD, NEW.dbo.Table2 NEW WHERE OLD.Field1 = NEW.Field1

I forgot to add the owner field  [database].[owner].[table]

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