In order to make an Express database available as a data source for a query, you must attach the database. If you want to fetch data from multiple sources, you can attach more than one database concurrently.
Important: Do not attach multiple databases that use the same object names. Doing so can produce unpredictable results.
To attach a database:In the Express Query dialog box, choose Attach Database.
Locate the database file that you want to open.
Choose Open to attach the database file.
To attach additional databases, repeat Steps 1 through 3.
About working with Express data
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