1 --student学生表(sno,sname,sex,birthday,tel) 2 --Course课程表(cno,cname) 3 --Sc 学生成绩表(sno,cno,score) 4 1.查询数学成绩在60分以下的学生 5 Select sno,sname from sc t1 join student t2 on t1.sno=t2.sno 6 Join course t3 on t1.cno=t3.cno 7 where t3.cname='数学' and t1.score<60…