指定时间修改数据库某字段的值

1.指定时间：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,固定时间：
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 ;