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 device_id) did_cnt,count(*) question_cnt
from question_practice_detail
where year(date)=2021 and month(date)=8
from question_practice_detail
where year(date)=2021 and month(date)=8
