题解 | #计算用户8月每天的练题数量#

select
DATE_FORMAT(date,'%e') as day,
count(question_id)
from question_practice_detail
WHERE
DATE_FORMAT(date,'%Y-%m')='2021-08'
group by day

DATE_FORMAT(date,'%Y-%m')='2021-08'筛选出八月份
DATE_FORMAT(date,'%e') as day 在求出天，进行分组，聚合函数求出8月份每天练题次数