MYSQL中ERROR 1005 (HY000): Can't create table 错误

今天修复一个MYSQL数据库时遇到的一个小问题：

CREATE TABLE `erp_employee` (
`id` int(10) unsigned NOT NULL auto_increment,
`employee_name` varchar(32) default NULL,
`user_id` int(11) default NULL,
`type` varchar(32) default NULL,
`gmt_create` timestamp NOT NULL default CURRENT_TIMESTAMP,
`gmt_modified` timestamp NOT NULL default '2000-01-01 00:00:00',
`employee_tel` varchar(64) default NULL,
`employee_sex` varchar(16) default NULL,
`sell_money` double default '0',
`per_price` double default '0',
`order_num` int(10) unsigned default '0',
`response_time` int(10) unsigned default '0',
`order_no_pay` int(10) unsigned default '0',
`pay_num` int(10) unsigned NOT NULL default '0',
`order_no_pay_money` double NOT NULL default '0',
`receive_num` int(10) unsigned NOT NULL default '0',
`order_change_rate` double NOT NULL default '0',
`is_deleted` varchar(2) NOT NULL default 'n',
`pay_per_num` int(11) default NULL,
PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `erp_receiver_shop` (
`id` int(11) NOT NULL auto_increment,
`fk_employee_id` int(10) NOT NULL,
`nick_name` varchar(64) default NULL,
`gmt_create` timestamp NOT NULL default CURRENT_TIMESTAMP,
`user_id` int(11) default NULL,
PRIMARY KEY (`id`),
KEY `fk_employee_id` (`fk_employee_id`),
CONSTRAINT `fk_employee_id` FOREIGN KEY (`fk_employee_id`) REFERENCES `erp_employee` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

出现的报错：


ERROR 1005 (HY000): Can't create table './supererpthree/#sql-2491_cceb2.frm' (errno: 150)

主要问题是：

FOREIGN KEY (`fk_employee_id`) REFERENCES `erp_employee` (`id`) 中`erp_receiver_shop`表的 `fk_employee_id` 是int和`erp_employee`表中的id设置的关联字段类型不匹配,`erp_receiver_shop`表中`fk_employee_id` 改正成:`fk_employee_id` int(10) unsigned NOT NULL ,就不会报错了，创修改表地时候常常一步小小就忘记了这个.

以前遇到一次，今天又犯了一次 下不为例。