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use strict;

...
Windows,XP PRO,Yes
Windows,XP Home,No
Windows,XP PRO,Yes

my $sth = $dbh->prepare("select OS, RELEASE, LIKE from $table");
$sth->execute();
...
while ( my ($os, $release, $like) = $sth->fetchrow ) {
  ++$data{$os}{$release}{$like};
}