join from two different databases

[Richard Reina]

I am try to do a join with tables that are in two different databases.

I thing I've got the actual SQL syntax down:

my $q = "SELECT i.inv_no, i.inv_date,
        c.cust_name
        FROM receivables.invoice i, sales.customer c,
	WHERE i.paid_date IS NULL"; 

but I am confused on how to prepare and execute it, since my database
handle ($dbh) specifies only 1 database.

Any help would get me out of the office on St. Pats day and in fron tof
a bar maid serving green beer.  Please help make my day.