Using Laurent_R's hash solution, combined with proper CSV parsing, I'd propose:

use Text::CSV_XS qw( csv );

my %acc;
my $aoa = csv (in => "test.csv", on_in => sub {
    $acc{pack "L>L>", $_[1][0], $_[1][1]} += $_[1][2]; });
csv (in => [ map { [(unpack "L>L>", $_), $acc{$_}] } sort keys %acc ])
+;

[download]

Enjoy, Have FUN! H.Merijn

In reply to Re: perl group by and sort from a csv input file by Tux
in thread perl group by and sort from a csv input file by gowthamvels

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