题解 | #统计作答次数#
统计作答次数
https://www.nowcoder.com/practice/45a87639110841b6950ef6a12d20175f
select count(start_time) as total_pv,count(submit_time) as complete_pv,(select count(distinct exam_id) from exam_record where score is not null)as complete_exam_cnt from exam_record
