Select Code to Download

__DATA__
U1     ID1     100     280
...
U1     ID2     100     100
U3     ID1     100     600
U9     ID3     137     200

example output: (Field[0])
U1     3     337     3     630     
U2     1     150     1     375
U3     1     100     1     600
U9     1     137     1     200

example output: (Field[1])
ID1     3     300     3     1130
ID2     2     250     2     475
ID3     1     137     1     200

$res{$fields[0]}{$column}{instance}++;
$res{$fields[0]}{$column}{volume} += $fields[$column];

$res{$fields[0]}{instance}++;
$res{$fields[0]}{volume} += $fields[1];
$res{$fields[0]}{instance2}= (<insert code to count field[2]>)
$res{$fields[0]}{volume2} += $fields[2];