题解 | #统计作答次数#
统计作答次数
http://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;
统计作答次数
http://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;
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