题解 | #21年8月份练题总数#
21年8月份练题总数
https://www.nowcoder.com/practice/b8f30b239b454ed490367b53ea95607d
select
count(distinct device_id) as did_cnt,
count(question_id) as question_cnt
from question_practice_detail
#where date like "2021-08%"
#要改成08，8会有问题
#where month(date) = '08'
where date_format(date, '%Y-%m') = '2021-08'
