SELECT A.device_id,A.university, IF(B.question_cnt is null , 0, B.question_cnt), IF(B.right_question_cnt is null , 0,B.right_question_cnt) From user_profile A left join (select device_id,count(device_id) as question_cnt,sum(Case result when 'wrong' then 0 else 1 end ) as right_question_cnt From ques...
