找出重复数据并且保留最小ID数据
SELECT * FROM student WHERE id NOT IN ( SELECT t.id FROM ( SELECT MIN(id) AS id FROM student GROUP BY `name` ) t )

Column1    Column2     Column3     Column4     Column5

     1           B           X           X           X
     2           A           Y           Y           Y
     3           E           Z           Z           Z
     4           B           X           X           X
     5           C           Y           Y           Y
     6           E           Z           Z           Z
     7           C           X           X           X
     8           B           Y           Y           Y
     9           B           Z           Z           Z

select t.* from t where t.columnA = (select max(t2.columnA) from t t2 where t2.columnB = t.columnB);

If you actually want to remove them, then one method is:
delete from t where t.columnA < (select max(t2.columnA) from t t2 where t2.columnB = t.columnB);

select * FROM vol_du t1, vol_du t2 WHERE t1.duration > t2.duration AND t1.idnumber = t2.idnumber


SELECT memberid, idnumber, MAX(duration) FROM vol_du GROUP BY idnumber;