题解 | #每个题目和每份试卷被作答的人数和次数#
每个题目和每份试卷被作答的人数和次数
https://www.nowcoder.com/practice/203d0aed8928429a8978185d9a03babc
select * from (select exam_id tid,count(distinct uid) uv,count(uid) pv from exam_record group by exam_id order by uv desc,pv desc) t1 union select * from (select question_id tid,count(distinct uid) uv,count(uid) pv from practice_record group by question_id order by uv desc,pv desc) t2;
直接union会导致无法按照试卷和题目的顺序，所以先分别排序后再union
投递阿里云等公司7个岗位
