Select only last value using group by at mysql

Question

I have one table with data about attendance into some events. I have in the table the data of the attendance everytime the user sends new attendance, the information is like

Answer 1

SELECT id_branch_channel, id_member, attendance, timestamp, id_member 
FROM (select * from view_event_attendance order by timestamp desc) as whatever
WHERE id_event = 782 
GROUP BY id_event,id_member;

EDIT: This may yield better performance:

SELECT *
FROM (SELECT id_branch_channel, id_member, attendance, timestamp, id_member 
      FROM view_event_attendance 
      WHERE id_event = 782 
      ORDER BY timestamp desc
     ) as whatever
GROUP BY id_event,id_member;

As long as the result-set can fit into the Innodb_buffer_pool, you will not see a significant performance drop.