题解 | #21年8月份练题总数#
21年8月份练题总数
http://www.nowcoder.com/practice/b8f30b239b454ed490367b53ea95607d
select
count(distinct q.device_id) as did_cnt,
count(q.question_id) as question_cnt
from
question_practice_detail q
where
month(q.date) = 8 ;