When I run the following slect 

SELECT STGPOOLS.STGPOOL_NAME, STGPOOLS.MAXSCRATCH,
Count(STGPOOLS.MAXSCRATCH) as "Allocated_SCRATCH" FROM STGPOOLS
STGPOOLS, VOLUMES VOLUMES WHERE VOLUMES.STGPOOL_NAME =
STGPOOLS.STGPOOL_NAME AND ((STGPOOLS.DEVCLASS='3592TAPE')) GROUP BY
STGPOOLS.STGPOOL_NAME, STGPOOLS.MAXSCRATCH

I get the following out put 

Server STGPOOL_NAME                     MAXSCRATCH
Allocated_SCRATCH 
 MSPSTG3 TAPE_APP_BACKUP                 20                     58 
 MSPSTG3 TAPE_ARCHIVE                   40                      30 
 MSPSTG3 TAPE_ARCHIVE_COPY              80                          39 
 MSPSTG3 TAPE_BACKUP_COPY               250                       193 
 MSPSTG3 TAPE_DB_BACKUP                 18                          18



My question is how do I subtract "Allocated_SCRATCH Col from the
MaxScratch Col so I can see what the Acutal Scratch Remaining is.  The
plan is to have this be out put to a txt file that can be picked up by
our monitoring system so we can auto genertae a help desk ticket.  I
have searched around (here and the web) and can't seem to find a good
example.

Any insight would be great!!!!!!