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($mb_award,$mb_accept) = $dbh->fetchrow_array();

use Data::Dumper;
...
...

$mb_award = $res[0];
$mb_accept = $res[1];

if ($mb_award > 0) {
  $mb_amount_disp = $mb_award;
...
  # both values are <= 0 or undef, what shall I do?
  ....
}