select emp_id, emp_level, exam_tag from ( SELECT emp_id, emp_level, exam_id, tag exam_tag from ( SELECT emp_id, emp_level, exam_id, score, tag, 考试分钟, avg(考试分钟) over ( partition by tag ) as 同类平均考试分钟, avg(score) over ( partition by tag ) 同类平均分数 from ( select A.emp_id, A.exam_id, A.score, B.tag, timest...