题解 | #统计有未完成状态的试卷的未完成数和未完成率#
统计有未完成状态的试卷的未完成数和未完成率
https://www.nowcoder.com/practice/69fc2b1df4144c0991e4b8280d8aba27
select
exam_id,
sum(if (submit_time is null, 1, 0)) incomplete_cnt,
round(
sum(if (submit_time is null, 1, 0)) / count(exam_id),
3
) complete_rate
from
exam_record
group by
exam_id
having
incomplete_cnt > 0
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