SELECT uid, sum(if(submit_time IS NULL, 1, 0)) incomplete_cnt, count(submit_time) complete_cnt, group_concat(DISTINCT date_format(start_time,'%Y-%m-%d'),':',tag SEPARATOR ';') detail FROM exam_record e JOIN examination_info ei ON e.exam_id = ei.exam_id WHERE YEAR(start_time) = 2021 GROUP BY uid...