create PROCEDURE daily_max_avg_online()
BEGIN
declare max_online int;
declare avg_online int;
declare time TIMESTAMP;
declare cur cursor for 
select MAX(online_num),round(avg(online_num)),
DATE_FORMAT(statistical_time ,'%y-%m-%d') 
from real_time_online_statistics 
group by DATE_FORMAT(statistical_time ,'%y-%m-%d');

open cur;
cur:loop
FETCH cur into max_online,avg_online,time;

insert into daily_max_avg_online_statistics(id,max_online_num,avg_online_num,statistical_time) 
values(UUID(),max_online,avg_online,time); 
end loop cur;
close cur;

END;