Query Help using Except

I'm interested in finding the minimim A.id such that the following holds:

select A.charge
, B.user_id
, C.employee_id
from A
inner join B using (user_id)
inner join C using (employee_id)

except

select X.charge
, Y.user_id
, Z.employee_id
from X
inner join Y using (user_id)
inner join Z using (employee_id)

--

I can't do the following, since the number of selected columns have to match:

select A.id
, A.charge
, B.user_id
, C.employee_id
from A
inner join B using (user_id)
inner join C using (employee_id)

except

select X.charge
, Y.user_id
, Z.employee_id
from X
inner join Y using (user_id)
inner join Z using (employee_id)

Can someone help me with the query?

Thanks in advance.

__________________________________________________________________
McAfee VirusScan Online from the Netscape Network.
Comprehensive protection for your entire computer. Get your free trial today!
http://channels.netscape.com/ns/computing/mcafee/index.jsp?promo=393397

Get AOL Instant Messenger 5.1 free of charge. Download Now!
http://aim.aol.com/aimnew/Aim/register.adp?promo=380455