MySQL update statement to store ranking positions

Question

I\'m trying to get my head around a query and I just can\'t figure it out. I would appreciate if someone give me a pointer. As a simple example of what I\'m trying to achiev

Answer 1

SET @r = 0;
UPDATE players JOIN (SELECT @r := @r + 1 AS rank, id FROM players ORDER BY rank DESC)
AS sorted USING(id) SET players.rank = sorted.rank;