MySQL: Group by kullanmadan önce ORDER by kullanımı

function data() {
$sorgu=mysql_query("select * from tablo");
$say=0;
while ($oku=mysql_fetch_array($sorgu)) {
      $data[$say]['id']=$oku['id'];
      $data[$say]['name']=$oku['name'];
      $data[$say]['date_submitted']=$oku['date_submitted'];
      $data[$say]['departman']=$oku['departman'];

 $say++;
}

return $data;
}

$data=data();

 $templevel=0;   

  $newkey=0;

  $grouparr[$templevel]="";

  foreach ($data as $key => $val) {
   if ($templevel==$val['departman']){
     $grouparr[$templevel][$newkey]=$val;
   } else {
     $grouparr[$val['departman']][$newkey]=$val;
   }
     $newkey++;       
  }
print_r($grouparr);

print_r($grouparr[1]);

SELECT * FROM (select * from `tablo` order by score desc) as tablo_tmp group by departman ORDER BY id ASC