delimiter $$
create event if not exists yesterday_sign_log
on schedule every 1 day
starts timestamp '2017-05-03 23:50'
on completion preserve enable
do begin
drop table if exists yesterdaySignInfo;
create table yesterdaySignInfo like signInfo;
insert into yesterdaySignInfo select * from signInfo;
end $$
delimiter;
用mysql事件可以解決
//開啟事件調度器
// 建立事件
sql可以這麼寫