1.指定時間：
DROP EVENT IF EXISTS `event_at`;
DELIMITER ;;
CREATE DEFINER=`root`@`localhost` EVENT `event_at` ON SCHEDULE AT '2017-12-6 19:30:00' ON COMPLETION NOT PRESERVE ENABLE DO 

BEGIN
    update USER set age=0;
END
;;
DELIMITER ;


2,固定時間：

DROP EVENT IF EXISTS `event_minute`;
DELIMITER ;;
CREATE DEFINER=
 
`root`@`localhost` EVENT `event_minute` ON SCHEDULE EVERY 1 MINUTE STARTS '2017-12-6 19:30:00' ON COMPLETION NOT PRESERVE ENABLE DO 

BEGIN
   sql...
END
;;
DELIMITER ;