题解 | #计算用户8月每天的练题数量#
计算用户8月每天的练题数量
https://www.nowcoder.com/practice/847373e2fe8d47b4a2c294bdb5bda8b6
select substring(date,9,8) as day,count(date) from question_practice_detail
group by date
having date like '2021-08%'
substring(字符串,截取开始位置,截取结束)
