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(exam_id) and score is not null) complete_exam_cnt from exam_record;
已完成的试卷数，已完成时才计数用if判断，试卷可能被完成多次，需要去重用distinct
count(distinct if(submit_time is not null, exam_id, null))
或
count(distinct case when score is not null then exam_id else null end)
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