mysql排名前三怎么写 mysql查询排名前5的语句

大神进：MYSQL各科成绩前三名

select * from

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(select Student.S#,Sname,Sage,Ssex,SC.C#,score,Cname

from SC inner join Student on SC.S#=Student.S#

inner join Course on Course.C#=SC.C#) as t

where exists(

select count(1) from t as d

where C#=d.C# and score d.score

having count(1)3

)

sql语句 每科成绩的前三名

可以用row_number函数来解决。

1、创建测试表，插入数据：

create table sc

(id int,

name varchar(20),

class varchar(20),

score int);

insert into sc values (1,'badkano','一年一班',100)

insert into sc values (2,'百度知道团长','一年一班',99)

insert into sc values (3,'du小短','一年一班',95)

insert into sc values (4,'du小小动','一年一班',97)

insert into sc values (5,'du小智','一年一班',80)

insert into sc values (6,'吕布','一年二班',67)

insert into sc values (7,'赵云','一年二班',90)

insert into sc values (8,'典韦','一年二班',89)

insert into sc values (9,'关羽','一年二班',70)

insert into sc values (10,'马超','一年二班',98)

2、查询每个班级的前三名，可用语句：

select * from

(select row_number() over (partition by class order by score desc) 排名,* from sc) t

where 排名=3 order by class asc,score desc

Mysql 分组以后取每组的前三名数据

Try this one,should be fine

下面这个已经有排序了哦，不行么？

SELECT uid, group_concat(subject)

FROM (SELECT id, uid, subject

FROM (SELECT id, uid, subject,

(SELECT COUNT(*)

FROM t_subject

WHERE uid = t.uid

AND subject = t.subject) RK

FROM t_subject t) t1

WHERE rk = 3) t2

GROUP BY uid

多了个a.原来

或者你直接用个substring()得了。。。