select a.device_id ,'复旦大学' as university ,count(b.question_id) as question_cnt ,sum(if(b.result = 'right',1,0)) as right_question_cnt from (select device_id from user_profile where university = '复旦大学') a left join question_practice_detail b on a.device_id = b.device_id and date_format(b.date,'%Y-%m'...