题解 | 验证刷题效果，输出题目真实通过率
select
user_id,
count(distinct if (result_info = 1, question_id, null)) / count(distinct question_id) as question_pass_rate,
count(if (result_info = 1, question_id, null)) / count(done_time) as pass_rate,
count(done_time) / count(distinct question_id) as question_per_cnt
from
done_questions_record
group by
user_id
having
question_pass_rate > 0.6
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