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

Here is one option (untested):

SELECT v.id_branch_channel, v.id_member, v.attendance, v.timestamp, v.id_member 
FROM view_event_attendance v
    JOIN (
        SELECT id_event, id_member, MAX(attendance) maxattendance
        FROM view_event_attendance 
        GROUP BY id_event, id_member ) m ON 
            v.id_event = m.id_event AND
            v.id_member = m.id_member AND
            v.attendance = m.maxattendance
WHERE v.id_event = 782 
GROUP BY v.id_member;

The concept is to get the MAX() of timestamp and use that field to JOIN on your view. You might not need all the fields -- really depends on your table structure. But this should get you going in the correct direction.