select ui.uid,s1.act_month_total,s2.act_days_2021,s3.act_days_2021_exam,s4.act_days_2021_question from ( select* from user_info where level=6 or level=7 ) as ui left join( (select ui.uid,if(count(distinct act_date) is null,0,count(distinct act_date))as act_month_total from ( select* from user_info w...