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) as did_cnt,count(question_id) as question_cnt from
question_practice_detail where month(date)=8&&year(date)=2021;
question_practice_detail where month(date)=8&&year(date)=2021;