题解 | #统计作答次数#
统计作答次数
http://www.nowcoder.com/practice/45a87639110841b6950ef6a12d20175f
select
count(er.id) as total_pv,
sum(case when er.submit_time is not null then 1 else 0 end) as complete_pv,
count(distinct case when er.submit_time is not null then er.exam_id end)
as complete_exam_cnt
from
exam_record er ;
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