SQL Query Help Please !

Hi all

I am using the following query for data to be displayed in crosstab :

  SELECT   closedate,status,
           SUM (CASE WHEN empcode = 'NT-028' THEN 1 ELSE 0 END) AS NT028,
           SUM (CASE WHEN empcode = 'NT-031' THEN 1 ELSE 0 END) AS NT031,
           SUM (CASE WHEN empcode = 'NT-050' THEN 1 ELSE 0 END) AS NT050,
           SUM (CASE WHEN empcode = 'NT-062' THEN 1 ELSE 0 END) AS NT062
        FROM   dbcleaning
   WHERE   status = 'Fixed'
           AND empcode IN
                    ('NT-028',
                     'NT-031',
                     'NT-050',
                     'NT-062')
GROUP BY   closedate, status

Now i need a column in the same result of the query which shows the
difference between the two columns .

For Example :

the result shoud be

Closedate , status ,  NT028, NT031, NT050,NT062 , NT028-NT031

Please note the last column in bold, i need the difference .

Any help will be highly appreciated
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