Connecting to new database inside admincp

[Eikinskjaldi]

Assuming its a database on the same server as the main vb one, you just need to add a database prefix to the sql. Mysql doesn't really care where tables live, and is even more than happy to join across databases.

select db1.table1.fieldA, db2.table2.fieldB
from db1.table1
join db2.table2 using (fieldC)

You can use the vb db wrapper for this ($vbulletin->db->query etc)