题解 | #统计作答次数#

统计作答次数

https://www.nowcoder.com/practice/45a87639110841b6950ef6a12d20175f

select count(*) as total_pv,
count(submit_time) as complete_pv,
count(distinct if(submit_time is null,exam_id,null)) as complete_exam_cnt
from exam_record

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