query with join across multiple databases-syntax error

Question

I have 2 databases namely db1,db2. I need a query that fetch the data from these dbs(db1,db2) which have inturn 2 tables(concessions,invoicing) each.

In db1.concessions

Answer 1

select * from(
SELECT a.concession as db1_CON_NUMBER FROM BABMwork6_5_3108.dbo.concessions as a  
        WHERE (a.manuell_archive_delete! = 'Delete' OR  a.manuell_archive_delete IS NULL) 
UNION SELECT b.[Concession Number] as db1_CON_NUMBER  FROM BABMwork6_5_3108.dbo.invoicing as b) as tbl1 
INNER JOIN 
(SELECT c.concession as db2_CON_NUMBER FROM BABMwork6_6_2909.dbo.concessions as c  
        WHERE (c.manuell_archive_delete! = 'Delete' OR  c.manuell_archive_delete IS NULL) 
UNION SELECT d.[Concession Number] as db2_CON_NUMBER  FROM BABMwork6_6_2909.dbo.invoicing as d ) as tbl2
ON tbl1.[db1_CON_NUMBER] = tbl2.[db2_CON_NUMBER]