相关小知识点

1. Count(null) = 0
2. Sum(null) = null
3. null + 1 = null
4. 根据得分进行排名，分数为0 不进行排名

SELECT
    t.competition_id,
    t.player_id,
    (
        SELECT
            CASE WHEN t.score <= 0 THEN NULL ELSE COUNT(DISTINCT score) END # 当score小于等于0时，设定排名为null，否则根据where条件（t1.score > t.score）count不同的score值来获取排名
        FROM
            v_player_total_data t1
        WHERE
            t1.competition_id = t.competition_id
        AND t1.score > t.score
    ) + 1 score
FROM
    v_player_total_data t ORDER BY competition_id