select author, t3.month, round(sum(if(if_follow=2,-1,if_follow))/count(*),3) as fans_growth_rate, max(cnt) as total_fans from ( select author, date_format(start_time,'%Y-%m') as "month", if_follow, sum(if(if_follow=2,-1,if_follow)) over(partition by author order by date_format(start_time,'...