I am growing the following data structure from a flat file. The structure is as follows: 
my @Divisions = qw(ABER BERF CECC DADD);
my @rows;
my %AG;
my $Rec= {};
my %positions;

my $csv = Text::CSV_XS->new ({ binary => 1, auto_diag => 1},encoding =
+> "utf-8");

 
 #CSV file with comma delimited data
 
 open my $fh1, "<", "test.csv" or die "test.csv: $!";
 
 while (my $row = $csv->getline ($fh1)) {
     # do something with @$row


     
     
     if ($row->[12]) {
        push @rows, $row;
     
     }
     
     else {
        
        push @rows, $row;
     }
     
     
     }
 close $fh1 or die "data.csv: $!";



    
    
 foreach my $rec (@rows) {
        
        
        
        
      foreach my $dept (@Divisions) {
        
        
            if ($rec->[14] =~ /^$dept/ && $rec->[15] =~ /^A\W[1-5]|B\W
+[1-2]/) {
      
            
            my $Rec = { 
                          
                             
                             SECTION=>$rec->[0],
                             GRADE=>strip_hyphen($rec->[1]),
                             POSITION=>$rec->[2],
                             NAME=>invert_name($rec->[3]),
                             AGE =>convert_date($rec->[4]),
                             GENDER=>$rec->[5],
                             
           };
            

            push @{$AG{$rec->[10]}},$Rec;
            

            } 
 
            
            
            }
      
 }
      
      

 
foreach my $A (sort keys %AG) {
   
   
   foreach my $p (@{$AG{$A}})  {
          
        print $p->{'GRADE'}," ", $p->{'NAME'}," ",$p->{'POSITION'},$p-
+>{'AGE'}," ",$p->{'GENDER'}, "\n";
           
   }
   
}

[download]
Output of sample data structure using Dump: 


VAR1 = 'ABER - Advanced Technologies';
$VAR2 = [
          {
            
            'NAME' => 'J. Green',
            'DATE_OF_BIRTH' => '8/18/1959',
            'SECTION' => 'ABER',
            'POSITION' => 'DIRECTOR',
            'AGE' => 55,
            'GRADE' => 'B2'
          }
        ];
$VAR3 = 'BERF - Satellite Research';
$VAR4 = [
          {

            'NAME' => 'P. Smith',
            'DATE_OF_BIRTH' => '12/11/1957',
            'SECTION' => 'BERF',
            'POSITION' => 'CHIEF',
            'AGE' => 56,
            'GRADE' => 'B1'
          },
          {
            
            'NAME' => 'R. Forest',
            'DATE_OF_BIRTH' => '1/18/1954',
            'SECTION' => 'BERF',
            'POSITION' => 'SENIOR OFFICER',
            'AGE' => '60 GREEN',
            'GRADE' => 'A5'
          },
          {
           
            'NAME' => 'R.Forest',
            'DATE_OF_BIRTH' => '03/09/1964',
            'SECTION' => 'BERF',
            'POSITION' => 'SENIOR OFFICER',
            'AGE' => 'Vacant',
            'GRADE' => 'A5'
          },
          {

            'NAME' => 'K. King',
            'DATE_OF_BIRTH' => '8/9/1960',
            'SECTION' => 'BERF',
            'POSITION' => 'SENIOR OFFICER',
            'AGE' => 54,
            'FEMALE' => '',
            'GRADE' => 'A5'
          },

        ];

[download]

What I need to do is to count the number of duplicate GRADE keys (i.e. B1, A5,A4,etc.) and then to delete the GRADE key value so that it does not appear in the output if there is more than 1 GRADE key value of the same type.

Expected Output: 

B2, J. Green, DIRECTOR,55,M
B1,P.Smith,CHIEF,54,M
A5,R.Forest,SENIOR OFFICER,60,M
   K.King,SENIOR OFFICER,54, M (A5 is excluded because it appears more
+ than once)
   P.Turner,50, M (A5 is excluded because it appears more than once)

[download]

Any pointers would really be appreciated.

In reply to Finding Duplicates and Deleting in a Complex Data Structure by GuiPerl

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