java学习
select a.class,a.score from student a where (select count(*) from student where class=a.class and a.score<score)<3order by a.class,a.score desc;
posted on 2018-08-09 14:32 杨军威 阅读(521) 评论(0) 编辑 收藏
Powered by: BlogJava Copyright © 杨军威