题解 | #统计作答次数#
统计作答次数
https://www.nowcoder.com/practice/45a87639110841b6950ef6a12d20175f
select count(start_time) total_pv, count(submit_time) complete_pv, count(distinct if(submit_time is null, exam_id, null)) complete_exam_cnt from exam_record;
统计作答次数
https://www.nowcoder.com/practice/45a87639110841b6950ef6a12d20175f
select count(start_time) total_pv, count(submit_time) complete_pv, count(distinct if(submit_time is null, exam_id, null)) complete_exam_cnt from exam_record;
相关推荐