1、查看事件是否开启
SHOW VARIABLES LIKE ‘event_scheduler‘;

2、开启事件
SET GLOBAL event_scheduler = ON;

3、创建事件
DELIMITER $$

-- SET GLOBAL event_scheduler = ON$$ -- required for event to execute but not create

CREATE /*[DEFINER = { user | CURRENT_USER }]*/ EVENT `db_name`.`everyday_refresh`

ON SCHEDULE EVERY 1 DAY STARTS ‘2014-07-22 11:00:00‘ ON COMPLETION PRESERVE DISABLE ON SLAVE

DO
BEGIN
UPDATE `tb_times` SET remanent_times = GREATEST(`remanent_times`,new_times);
END$$

DELIMITER ;