If you don't want to lose records, stop overwriting them. 
$s = 123;
$s = 456;
print "$s\n";  # 456

$a[1] = 123;
$a[1] = 456;
print "$a[1]\n";  # 456

$h{foo} = 123;
$h{foo} = 456;
print "$h{foo}\n";  # 456

[download]
Maybe what you want is an hash of arrays? 
push @{ $h{$k} }, 123;
push @{ $h{$k} }, 456;
print "$_\n" for @{ $h{$k} };  # 123, 456

[download]

In reply to Re: Hash throws out duplicate values by ikegami
in thread Hash throws out duplicate values by spickles

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