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 day(a.date) as day,count(question_id)question_cnt from question_practice_detail a where year(date)=2021 and month(date)=8 group by day
记得用group by进行分组