เว็บบอร์ด (sql) ให้เรียงกระทู้ตามการอัพเดทล่าสุด ทำยังไงหนอ

CREATE TABLE `webboard` (
`QuestionID` int(5) unsigned zerofill NOT NULL auto_increment,
`CreateDate` datetime NOT NULL,
`Question` varchar(255) NOT NULL,
`Details` text NOT NULL,
`Name` varchar(50) NOT NULL,
`View` int(5) NOT NULL,
`Reply` int(5) NOT NULL,
PRIMARY KEY (`QuestionID`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;


CREATE TABLE `reply` (
`ReplyID` int(5) unsigned zerofill NOT NULL auto_increment,
`QuestionID` int(5) unsigned zerofill NOT NULL,
`CreateDate` datetime NOT NULL,
`Details` text NOT NULL,
`Name` varchar(50) NOT NULL,
PRIMARY KEY (`ReplyID`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;