Update the rank in a MySQL Table

Question

I have the following table structure for a table Player

Table Player {  
Long playerID;  
Long points;  
Long rank;  
}

Assuming that th

Answer 1

Daniel, you have very nice solution. Except one point - the tie case. If tie happens between 3 players this update doesn't work properly. I changed your solution as following:

UPDATE player  
    JOIN (SELECT p.playerID,  
                 IF(@lastPoint <> p.points,  
                    @curRank := @curRank + @nextrank,  
                    @curRank)  AS rank,  
                 IF(@lastPoint = p.points,  
                    @nextrank := @nextrank + 1,  
                    @nextrank := 1),  
                 @lastPoint := p.points  
            FROM player p  
            JOIN (SELECT @curRank := 0, @lastPoint := 0, @nextrank := 1) r  
           ORDER BY  p.points DESC  
          ) ranks ON (ranks.playerID = player.playerID)  
SET player.rank = ranks.rank;