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
(select * from question_practice_detail
where DATE_FORMAT(date,'%Y-%m')='2021-08') as a;
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