select distinct author,date_format(start_time,'%Y-%m') month, round(avg(if(if_follow=2,-1,if_follow))over(partition by author,date_format(start_time,'%Y-%m') ),3) fans_grouwth_rate, sum(if(if_follow=2,-1,if_follow))over(partition by author order by date_format(start_time,'%Y-%m')) total_fans from tb...