Show us some code. Ideally a trivial database using something like the following as a starting point:

#!/usr/bin/perl
use strict;
use warnings;
use DBI;

unlink 'results';
open my $resFile, '>', 'results';
print $resFile <<DATA;
Joe,A,1,85,90
Joe,A,1,80,99
Joe,A,2,50,70
Joe,A,2,60,65
Joe,A,2,87,89
Joe,B,1,82,92
Joe,B,3,30,51
Rob,A,1,85,90
Rob,A,1,80,99
Rob,A,2,50,70
Rob,A,2,60,65
Rob,A,2,87,89
Rob,B,1,82,92
Rob,B,3,30,51
DATA
close $resFile;

my $dbh = DBI->connect("DBI:CSV:") or die $DBI::errstr;
my $sth = $dbh->prepare("SELECT * FROM results");

$sth->execute();

my $arrayRef  = $sth->fetchall_arrayref;

print +(join ', ', @$_), "\n" for @$arrayRef;

exit;

[download]

Prints:

Joe, A, 1, 80, 99
Joe, A, 2, 50, 70
Joe, A, 2, 60, 65
Joe, A, 2, 87, 89
Joe, B, 1, 82, 92
Joe, B, 3, 30, 51
Rob, A, 1, 85, 90
Rob, A, 1, 80, 99
Rob, A, 2, 50, 70
Rob, A, 2, 60, 65
Rob, A, 2, 87, 89
Rob, B, 1, 82, 92
Rob, B, 3, 30, 51

[download]
True laziness is hard work

In reply to Re: hoh or hoa data structure by GrandFather
in thread hoh or hoa data structure by rocky13

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