my $counter = 0;

while (@ary = $sth->fetchrow_array ())
{
    if ($ary[$counter] == NULL){
     print join("\t",@array[$counter]), " ","\n";
     $counter++;
    }
    else
    {
    print join("\t",@array[$counter]), $ary[$counter],"\n";
    }

    $counter++;

}