select count(start_time) as total_pv,
COUNT(submit_time) as complete_pv,
#去除未完成的试卷
COUNT(distinct exam_id and score is not null) as complete_exam_cnt
from
exam_record;
select count(start_time) as total_pv,
COUNT(submit_time) as complete_pv,
#去除未完成的试卷
COUNT(distinct exam_id and score is not null) as complete_exam_cnt
from
exam_record;