حذف رکوردهای تکراری

$sql="select distinct full_add as full_add from TableName";
$result=mysql_query($sql);
while($row=mysql_fetch_array($result))
{
    $full_add=$row["full_add"];
    $sql2="select * from TableName where full_add='$full_add'";
    $num=mysql_num_rows(mysql_query($sql2));
    $res=mysql_query($sql2);
    // if $num > 1 then it will containduplicate records
    if($num > 1)
    {
        $check=0;
        while($row_dup=mysql_fetch_array($res))
        {
            // if $check > 0 that's mean first record is passed
            if($check> 0)
            {
                $id=$row_dup["id"];
                $sql_del="delete from TableName where id=".$id;
                $res_del=mysql_query($sql_del) or die(mysql_error());
            }
            $check++;
        }
    }
}