要求: 1,查询两门及两门以上不及格的学生的平均分。比如:张三有两门功课不及格, 语文 50 分,地理 40分, 他的平均分为:(90+50+40)/3 = 60。 2,用 where 或 group by 或 having 等一条语句实现查询。
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