SQL表模式, time, country, activer_users 如果我只想显示一段时间内的活跃用户总数,下面的简单选择可以做到这一点 SELECT time, sum(active_users) as activer_users GROUP BY time ORDER BY time 返回的数据将是这样的, [{ "active_users": 2300
},....] 如果我希望按国家/地区随时间变化的active_users,那么 SELECT time, country, sum(active_