Error adding up columns

Question

All i have a strange problem when i run the following code it produces the
table, but the totals don't add up. If you look at the bottom row you can see the value is
one short, am i missing something.
     select trader, tradername,
          max( decode( MARKET, 'E-CBOT', cnt, 0 ) )"E-CBOT",
          max( decode( MARKET, 'GLOBEX', cnt, null ) )"GLOBEX",
          max( decode( MARKET, 'EUNXP', cnt, null ) )"EUNXP",
          max( decode( MARKET, 'EUNXPE', cnt, null ) )"EUNXPE",
          max( decode( MARKET, 'LIFFE', cnt, null ) )"LIFFE",
          max( decode( MARKET, 'LIFFEE', cnt, null ) )"LIFFEE",
          max( decode( MARKET, 'EUREX', cnt, null ) )"EUREX",     
          max( decode( MARKET, 'HKFE', cnt, null ) )"HKFE",
          max( decode( MARKET, 'IDEM', cnt, null ) )"IDEM",
          max( decode( MARKET, 'IPE', cnt, null ) )"IPE",
          max( decode( MARKET, 'ISE', cnt, null ) )"ISE",
          max( decode( MARKET, 'AEX', cnt, null ) )"AEX",
          max( decode( MARKET, 'MTRL', cnt, null ) )"MTRL",
          max( decode( MARKET, 'NYMEX', cnt, null ) )"NYMEX",
          max( decode( MARKET, 'NZFO', cnt, null ) )"NZFO",
          max( decode( MARKET, 'OSE', cnt, null ) )"OSE",
          max( decode( MARKET, 'SFE', cnt, null ) )"SFE",
          max( decode( MARKET, 'SGX', cnt, null ) )"SGX",
          max( decode( MARKET, 'TIFFEC', cnt, null ) )"TIFFEC",
          max( decode( MARKET, 'TSE', cnt, null ) )"TSE",
          max( decode( MARKET, 'TSEN', cnt, null ) )"TSEN",
          max( decode( MARKET, 'E-CBOT', cnt, 0 ) ) +
          max( decode( MARKET, 'GLOBEX', cnt, 0 ) ) +
          max( decode( MARKET, 'EUNXP', cnt, 0 ) ) +
          max( decode( MARKET, 'EUNXPE', cnt, 0 ) ) +
          max( decode( MARKET, 'LIFFE', cnt, 0 ) ) +
          max( decode( MARKET, 'LIFFEE', cnt, 0 ) ) +
          max( decode( MARKET, 'EUREX', cnt, 0 ) ) +
          max( decode( MARKET, 'HKFE', cnt, 0 ) ) +
          max( decode( MARKET, 'IDEM', cnt, 0 ) ) +
          max( decode( MARKET, 'IPE', cnt, 0 ) ) +
          max( decode( MARKET, 'ISE', cnt, 0 ) ) +
          max( decode( MARKET, 'AEX', cnt, 0 ) ) +
          max( decode( MARKET, 'MTRL', cnt, 0 ) ) +
          max( decode( MARKET, 'NYMEX', cnt, 0 ) ) +
          max( decode( MARKET, 'NZFO', cnt, 0 ) ) +
          max( decode( MARKET, 'OSE', cnt, 0 ) ) +
          max( decode( MARKET, 'SFE', cnt, 0 ) ) +
          max( decode( MARKET, 'TIFFEC', cnt, 0 ) ) +
          max( decode( MARKET, 'TSE', cnt, 0 ) ) +
          max( decode( MARKET, 'TSEN', cnt, 0 ) ) +
          max( decode( MARKET, 'TEX', cnt, 0 ) ) TOTAL
          from (
          SELECT A1.trader, A1.TRADERNAME, A2.MARKET, SUM(A2.VOLUME) cnt
               FROM table1 A1, table2 A2
               where A1.trader = A2.GIMSG
               and A1.APPLICATION = :P44_SHOWCLIENTNAMES
               and A2.market != 'DBFX'
               and A2.market != '-'
               and A1.application != '?'
               and A2.BAF_INDICATOR not in ('B','E')
               and A2.ACTION = 'A'
               and A1.USERFRONTENDSYSTEM not in ('?','System',Data1,'N/A')
               and trunc(A2.TRADEDATE,'MONTH') between :P44_SHOWMONTH and :P44_SHOWMONTHBK
               group by A1.trader, A2.MARKET, A1.TRADERNAME
          group by trader, tradername
Trader     Name     E-Cbot     Globex     Liffe     Liffee     Eurex     Ipe     Sgx     Tse     Tsen     Total     
test1     tester     3,450     4,294     122          13,029     45     410     25     10     20,975     
test2     tester     40     208               163               1          412     
test3     tester     4     115               66                         185     
test4     tester     22     12     2          465          2               501     
Total          3,516     4,629     124     0     13,723     45     412     26     10     22,073

Answer 1

test4 tester 22 12 2 465 2 501
the total 501 is not true
22 + 12 + 2 + 465 + 2 = 503.The vertical totalling is all correct. What is wrong is the horizontal totalling. The values for Test1 and Test 4 are wrong, as is the total at the end. Test1 is out by 410, test4 by 2 and the total by 412. So it is consistent. The one market that fits this pattern is SGX. And lo! that market is missing from your Total aggregation.
Do I get a prize?
Cheers, APC
P.S. If you're on 10g you may wish to have a look at the SQL MODEL clause, as that is specifically designed to do this sort of spreadsheet-y calculations.