Student 字段 name ,classid,score
class 字段 classid,name
select a.name,b.name as class,score
from student a,class b
where (select count(1) from student c where a.classid=c.classid and c.score>a.score )<=3
Student 字段 name ,classid,score
class 字段 classid,name
select a.name,b.name as class,score
from student a,class b
where (select count(1) from student c where a.classid=c.classid and c.score>a.score )<=3
默認的:最高權限用戶:system 密碼:manager(我自己system) 管理員權限用戶:sys 密碼:change_on_install 普通用戶:scott