根据来自MySQL数据库的分数获取用户排名

Question

I have a function in my model of my codeigniter application that returns a list of rows in descending order of points. This is done to get the rows with the hihgest points.

public function top_points()
    {
        $this->db->order_by('points', 'desc'); 
        $query=$this->db->get('player', 50);
        $data = $query->result_array();
        return $data;
    }

This work fine in returning the data for the highest 50 points.

However I would like to find the position/rank of a particular player in the Player table which I am querying. I would like to a specific player by an id .

public function get_player_rank($player_id)
    {
            $this->db->where('player_id', $palyer_id); 
        $this->db->order_by('points', 'desc'); 
        $query=$this->db->get('player');
        $data = $query->result_array();
        return $data;
    }

I would like to use something like this to get the position of a player specified by his $id. Like a ranking in terms of his points earned.

How do i get this?

Answer 1

TRY

$sql = " 
SET @rownum=0;
SELECT player_id, rank 
FROM (
      SELECT player_id, @rownum := @rownum +1 AS rank FROM  `player` 
      ORDER BY  `points` DESC
     ) AS D
WHERE D.player_id=?";

$result = $this->db->query($sql,array($palyer_id))->row_array();

OR you could try

$sql = " 
         SELECT player_id, rank 
         FROM (
                SELECT player_id, @rownum := @rownum +1 AS rank
                FROM  `player` , (SELECT @rownum :=0 ) r
                ORDER BY  `points` DESC
              ) AS D
         WHERE D.player_id=?";
$result = $this->db->query($sql,array($palyer_id))->row_array();