题解 | #计算用户8月每天的练题数量#

select day(date) as day,
       count(question_id) as question_cnt
from question_practice_detail t1
where t1.date like '2021-08%'
group by day

select day(date) as day,
       count(question_id) as question_cnt
from question_practice_detail 
where date_format(date,'%Y-%m') = '2021-08'
group by day