select ei.tag,count(er.start_time) cnt from exam_record er,examination_info ei where er.exam_id=ei.exam_id and er.uid in( select a.uid from exam_record a where a.submit_time is not null group by a.uid having (count(a.exam_id)/count(distinct substr(a.submit_time,1,7)))>=3 ) group by ei.tag order b...
