mysql计算排名

mysql计算排名,获取行号rowno

学生成绩表数据

SELECT * FROM table_score ORDER BY score DESC;

 

获取某个学生成绩排名并计算该学生和上一名学生成绩差,是并列排名

SELECT *,
(SELECT count(DISTINCT score) FROM table_score AS b WHERE a.score<b.score)+1 AS rank, #获取排名,并列
(SELECT b.score FROM table_score AS b WHERE b.score>a.score ORDER BY b.score LIMIT 1)-a.score AS subtract #获取和上一名学生成绩的差 
FROM table_score AS a WHERE a.s_id = 13; #获取学生周一的成绩排名和与上一名的成绩差

 

获取所有学生成绩排名-并列排名

SELECT *,
(SELECT count(DISTINCT score) FROM table_score AS b WHERE a.score<b.score)+1 AS rank #获取排名-并列
FROM table_score AS a ORDER BY rank; #获取学生成绩排名

 

获取所有学生成绩排名,不是并列排名。计算行号进行排名

SELECT a.*,
(@rowNum:=@rowNum+1) AS rank #计算行号 
FROM table_score AS a, (SELECT (@rowNum :=0) ) b ORDER BY a.score DESC;

posted @ 2016-07-29 18:32  后土·K  阅读(18333)  评论(1编辑  收藏  举报