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  1. or download this
    my $AoH = [ sort {
    $a->{under} <=> $b->{undef}
    || $a->{order} <=> $b->{order}
} @$sqldata ];
  2. or download this
    (2 <=> 2) == 0 so
0 || 2 <=> 1 evaluates to 2 <=> 1
(2 <=> 1) == 1 # the answer we wanted
  3. or download this
    select ... order by under, order;