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_id) question_cnt
from question_practice_detail
where month(date) = '8'
count(distinct device_id) did_cnt,
count(question_id) question_cnt
from question_practice_detail
where month(date) = '8'