mysql怎么按单双数结果并类

$sql = mysql_query("SELECT * FROM article WHERE uid='132828' ORDER BY date LIMIT ".$number.",10 ");
$num = 1;
while($row = mysql_fetch_array($sql)){
   if($num ==1){
       echo '
';
   }
   if($num ==5){
       echo '
';
   }
   //这里的代码如何写，才能按单双数并类？
   if($num%5==0){
       echo '
';
   }
   $num++;
}

  
 1st result 
  
 3rd result 
  
 5th result 
  
 7th result 
  
 9th result 


  
 2nd result 
  
 4rd result 
  
 6th result 
  
 8th result 
  
 10th result 

     ul            ul
 ------------ ------------
| 1st result | 2nd result |
 ------------ ------------
| 3rd result | 4th result |
 ------------ ------------
| 5th result | 6th result |
 ------------ ------------
| 7th result | 8th result |
 ------------ ------------
| 9th result | 10th result|
 ------------ ------------

$num = 1;
while($row = mysql_fetch_array($sql)){
   if($num % 2)
   {
     $left[] = '
'.$row['title'].'
';
   }
   else $right[] = '
'.$row['title'].'
';
}

echo "
".implode("",$left).';
echo "
".implode("",$right).';

------解决方案--------------------
也可通过移动指针完成