摘要: 1、查询成绩比该课程平均成绩低的同学的成绩表 SELECT * FROM score AS a WHERE degree < (SELECT AVG(degree) FROM score AS b WHERE a.cno = b.cno) 2、查询所有任课教师的Tname和Depart. selec 阅读全文
posted @ 2021-06-28 23:25 Eleanor123 阅读(195) 评论(0) 推荐(0) 编辑