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https://blog.csdn.net/xiaoheibaqi/article/details/48781507 查询平均成绩小于60分的同学的学生编号和学生姓名和平均成绩 select a.S# , a.Sname , cast(avg(b.score) as decimal(18,2)) avg_score from Student a , sc b where a.S# = b.S# group by a.S# , a.Sname having ca ...
