题解 | #统计作答次数#
统计作答次数
https://www.nowcoder.com/practice/45a87639110841b6950ef6a12d20175f
select count(*),count(submit_time) as complete_pv, count(distinct exam_id,case when submit_time is not null then 1 else null end) as complete_exam_cnt from exam_record