标签:计算 mic tps sel rac 表数 pre table mit
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;
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来源:https://www.cnblogs.com/aeiou/p/5719396.html
更多参考:https://www.cnblogs.com/-mrl/p/9073375.html
标签:计算 mic tps sel rac 表数 pre table mit
原文地址:https://www.cnblogs.com/KillBugMe/p/13259838.html