Illegal mix of collations (gbk_chinese_ci,IMPLICIT) 
and (gbk_bin,IMPLICIT) for operation '=',
      SQL State: HY000, Error Code: 1267

CREATE TABLE `teachers` (
`id` int(11) NOT NULL default '0',
`name` varchar(20) default NULL,
`password` varchar(20) default NULL,
`department_id` int(11) default NULL,
PRIMARY KEY  (`id`)
      ) ENGINE=MyISAM DEFAULT CHARSET=gbk;

CREATE TABLE `teachers` (
`id` int(11) NOT NULL default '0',
`name` varchar(20) default NULL,
`password` varchar(20) default NULL,
`department_id` int(11) default NULL,
PRIMARY KEY  (`id`)
      ) ;