小编Del*_*Qin的帖子

我有这样一张桌子:

CREATE TABLE IF NOT EXISTS `session` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `token` varchar(32) NOT NULL,
  `profile` varchar(1000) NOT NULL,
  `created_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '????',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 AUTO_INCREMENT=41 ;

和此表中的一些数据:

(38, '395d5feaf28df01aafe0781a7f34acbe', 'a:3:{s:2:"id";s:1:"2";s:8:"username";s:7:"wanmeng";s:12:"created_time";s:19:"2011-11-18 19:37:33";}', '2011-12-03 14:14:35'),
(39, '0e0ca06ed9ad86937f190eb9544ac935', 'a:3:{s:2:"id";s:1:"1";s:8:"username";s:6:"delphi";s:12:"created_time";s:19:"2011-11-18 13:29:40";}', '2011-12-03 14:28:36'),
(31, '3cba76b97cf123009632bdaa5a306385', 'a:3:{s:2:"id";s:1:"1";s:8:"username";s:6:"delphi";s:12:"created_time";s:19:"2011-11-18 13:29:40";}', '2011-12-02 15:50:21'),
(30, 'fa356333dd3ee8f1b18b8bf0a827e34c', 'a:3:{s:2:"id";s:1:"1";s:8:"username";s:6:"delphi";s:12:"created_time";s:19:"2011-11-18 13:29:40";}', '2011-12-01 15:32:47')

当我执行查询时:SELECT*FROM sessionWHERE token = false,我希望没有返回结果,但是mysql返回结果:

39  0e0ca06ed9ad86937f190eb9544ac935    a:3:{s:2:"id";s:1:"1";s:8:"username";s:6:"delphi";...   2011-12-03 22:28:36
30  fa356333dd3ee8f1b18b8bf0a827e34c    a:3:{s:2:"id";s:1:"1";s:8:"username";s:6:"delphi";...   2011-12-01 23:32:47

看起来布尔值'false'可以匹配一些varchar,但是'fa356333dd3ee8f1b18b8bf0a827e34c'和'false'之间是否存在任何关系,为什么会这样？