1141. 查询近30天活跃用户数

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题目链接：1141. 查询近30天活跃用户数

代码如下：

# Write your MySQL query statement below
select activity_date as day,count(distinct user_id) as active_users
from Activity
where activity_date between '2019-06-28' and '2019-07-27'
group by activity_date