select e.uid,ifnull(a.act_month_total,0),ifnull(b.act_days_2021,0),ifnull(c.act_days_2021_exam,0),ifnull(d.act_days_2021_question,0) from (select uid,count(act_month_total) as act_month_total from (select distinct uid,act_month_total from (select uid,date_format(start_time,'%Y%m') as act_month_total...