Question

I have a two databases that contain the exact same tables and are on the same server. I want to be able to create a report that will allow me to “merge” these databases so that when a user queries they will query BOTH databases at the same time. Is that even possible?

Answer 1

The simplest way to achieve this would be to create database views that UNION ALL the values from the same tables in both databases – something like:

CREATE VIEW CombinedSalesTable AS
SELECT * FROM database1.SalesTable
UNION ALL
SELECT * FROM database2.SalesTable

– and design the reports to query the views.

You may want to add an additional column to the views to show which database each record comes from, as a key value that is unique in one table may have a “duplicate” in the equivalent table in the other database.