摘要: -- 2.查询“生物”课程比“物理”课程成绩高的所有学生的学号; -- select A.student_id,sw,ty from -- -- (select student_id,num as sw from score INNER join course on score.course_id = course.cid where course.cname = '生物'... 阅读全文
posted @ 2017-06-10 15:34 qianxiamo 阅读(157) 评论(0) 推荐(0) 编辑