I have been playing around with attaching databases.  I'm not sure what the
point is.
Assume that I have two databases with the same schema, say db1 and db2, and
I attach them to one connection.

In order to get the count from a particular table, I could do the following:

SELECT COUNT id FROM main.table UNION
SELECT COUNT id FROM db2.table

I would then step through the result and add the two values to get a total
count.


If I have two separate connections, I could run two queries and add the
results.
Is there a speed difference?

In general, what is the benefit of attaching databases verses maintaining
multiple connections?

TIA
TUD
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