--,--,--,--,1.280000e+2,9.930000e+0
--,--,--,--,1.920000e+2,9.950000e+0
--,--,--,--,2.560000e+2,1.013000e+1
--,--,--,--,2.000000e+0,4.370000e+0
--,--,--,--,4.000000e+0,5.300000e+0
--,--,--,--,8.000000e+0,6.590000e+0
--,--,--,--,1.600000e+1,7.830000e+0
--,--,--,--,2.400000e+1,8.710000e+0
--,--,--,--,3.200000e+1,9.160000e+0
--,--,--,--,6.400000e+1,9.510000e+0
--,2.000000e+0,6.500000e+0,--,--,--
--,2.000000e+0,6.450000e+0,--,--,--
--,4.000000e+0,6.650000e+0,--,--,--
--,4.000000e+0,6.570000e+0,--,--,--
--,8.000000e+0,6.550000e+0,--,--,--
--,8.000000e+0,6.600000e+0,--,--,--
--,1.600000e+1,6.570000e+0,--,--,--
--,1.600000e+1,6.570000e+0,--,--,--
--,2.400000e+1,6.650000e+0,--,--,--
--,2.400000e+1,6.680000e+0,--,--,--
--,2.400000e+1,6.640000e+0,--,--,--
--,3.200000e+1,6.720000e+0,--,--,--
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What I am trying to do is match up anything from the first half whose fifth value is equal to anything in the second halfs second value. Confused?
Imagine that the rows begining with --, --, --, -- are the first half and the rest the second. So now we have two seperate sets. Now ignore all "--". This leaves you with two sets of two columns. What I want to do is match the first in each of these sets. i.e. above the fourth row in the first half matched the first row in the second half. But then I don't want it to match the second. No value should be repeated.
I also need to maintain the order in the first half. And all unmatched values need to be printed at the end.

The desired order from above would be

2.000000e+0,4.370000e+0,2.000000e+0,6.500000e+0
4.000000e+0,5.300000e+0,4.000000e+0,6.650000e+0
8.000000e+0,6.590000e+0,8.000000e+0,6.550000e+0
1.600000e+1,7.830000e+0,1.600000e+1,6.570000e+0
2.400000e+1,8.710000e+0,2.400000e+1,6.650000e+0
3.200000e+1,9.160000e+0,3.200000e+1,6.720000e+0
1.280000e+2,9.930000e+0,--,--
1.920000e+2,9.950000e+0,--,--
2.560000e+2,1.013000e+1,--,--
6.400000e+1,9.510000e+0,--,--
--,--,2.000000e+0,6.450000e+0
--,--,4.000000e+0,6.570000e+0
--,--,8.000000e+0,6.600000e+0
--,--,1.600000e+1,6.570000e+0
--,--,2.400000e+1,6.680000e+0
--,--,3.200000e+1,6.720000e+0
[download]

The code I have at the moment is the following but I am having dificulty making it work. If you would rether create your own code than work on mine please fell free. A solution is solution.

#!/usr/bin/perl -w

use strict;
my $file = "< SqlResults_full";
my @leftarray;
my @rightarray;
my @temp;
my @left;
my @right;
my $j = 0;
my $k = 0;

open(DATA, $file) or die "Can\'t open " . $file . " for output : $!";

while(<DATA>){
        if (/^--,.*,--,--,--$/){
                chomp;
                my $leftline = $_;
                my @lefttemp = (split/,/, $leftline);
                my $leftcut =  $lefttemp[0] . ", " . $lefttemp[1] . ",
+ " . $lefttemp[2];
                push(@leftarray, $leftcut);
        }
        elsif (/^--,--,--,--,.*$/){
                chomp;
                my $rightline = $_;
                my @righttemp = (split/,/, $rightline);
                my $rightcut =  $righttemp[3] . ", " . $righttemp[4] .
+ ", " . $righttemp[5];
                push(@rightarray, $rightcut);
        }
}

my $leftsize = @leftarray;
print "Left side is " . $leftsize . "\n";
print "Right side is ". $rightsize . "\n";

for (my $rightcount=0;$rightcount < $rightsize;$rightcount++){

   my @right = split (/,/, $rightarray[$rightcount]);
   for (my $leftcount=0;$leftcount < $leftsize;$leftcount++){
        my @left = split (/,/, $leftarray[$leftcount]);

      if ($left[1] eq $right[1]){
        print $leftarray[$leftcount] . ", " . $rightarray[$rightcount]
+. "\n";
        splice(@rightarray, $rightcount, 1);
        $rightcount--;
        $rightsize--;
        splice(@leftarray, $leftcount, 1);
        $leftcount--;
        $leftsize--;
      }#if
   }#while
   print "\n";
}#while
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j o h n i r l .

Sum day soon I'Il lern how 2 spelI (nad tYpe)