题解 | #得分不小于平均分的最低分#
近三个月未完成试卷数为0的用户完成情况
http://www.nowcoder.com/practice/4a3acb02b34a4ecf9045cefbc05453fa
select uid, count(score) as exam_complete_cnt from ( select uid, start_time, score, dense_rank() over(PARTITION by uid order by date_format(start_time, '%Y%m') DESC) as ranking from exam_record ) table1 where ranking <= 3 group by uid having count(start_time) = count(score) order by exam_complete_cnt desc, uid desc