答案表结构都没有,所有sql语句都是扯淡select a.课程名, a.教师, t.maxScore, t.minScore, t.avgScorefrom课程表 a(SELECT 课程号, MAX(成绩) AS maxScore, MIN(成绩) AS minScore, AVG(成绩) as avgScoreFROM 选课表 GROUP BY 课程号) tWHERE a.课程号 = t.课程号...