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
http://www.nowcoder.com/practice/847373e2fe8d47b4a2c294bdb5bda8b6
select day(date) as day, count(question_id) as question_cnt
from question_practice_detail
where month(date) = 8
group by date
day month year 从日期中分别取出 日 月 年
