积分表：t_participant_points

1、带并列

SELECT
    p.*,
CASE
        WHEN @prevRank = p.total_points THEN
        @curRank 
        WHEN @prevRank := p.total_points THEN
        @curRank := @curRank + 1 
    END AS ranking 
FROM
    ( SELECT total_points FROM t_participant_points ORDER BY total_points DESC ) AS p,
    ( SELECT @curRank := 0, @prevRank := NULL ) r

运行效果：

 2、不带并列

SELECT
    p.*,
CASE
        WHEN @prevRank := p.total_points THEN
        @curRank := @curRank + 1 
    END AS ranking 
FROM
    ( SELECT total_points FROM t_participant_points ORDER BY total_points DESC ) AS p,
    ( SELECT @curRank := 0, @prevRank := NULL ) r

 运行效果：