20. 查询有考试成绩的所有学生的姓名、修课名称及考试成绩,要求将查询结果放在一张新的永久表中,假设新表名为new_sc。相关知识点: 试题来源: 解析 select sname, cname, grade into new_scfrom student s join sc on s.sno = sc.snojoin course c on c.cno = sc.cnowhere grade is not null...