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,
sum(if(score is not null, 1, 0)) as coplete_pv,
(select count(*)
from (select exam_id
from exam_record
where score is not null
group by exam_id) as new) as complete_exam_cnt
from exam_record;
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