mysql 引用密钥问题,phpmyadmin 错误代码 150

mysql refference key issue, phpmyadmin error code 150

我正在尝试创建两个 table,如下所示,

--
-- Table structure for table `users`
--

CREATE TABLE IF NOT EXISTS `users` (   `Id` int(11) NOT NULL
AUTO_INCREMENT,   `UserType` varchar(32) DEFAULT NULL,   `FirstName`
varchar(64) DEFAULT NULL,   `LastName` varchar(64) DEFAULT NULL,  
`Email` varchar(64) DEFAULT NULL,   `CompanyName` varchar(64) DEFAULT
NULL,   `Telephone` varchar(64) DEFAULT NULL,   `Country` varchar(64)
DEFAULT NULL,   `Website` varchar(64) DEFAULT NULL,   `JobTitle`
varchar(64) DEFAULT NULL,   `Active` int(1) DEFAULT NULL,   `Notes`
text,   `DateOfRegistration` datetime DEFAULT NULL,   PRIMARY KEY
(`Id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

--
-- Table structure for table `login`
--

CREATE TABLE IF NOT EXISTS `login` (   `Id` int(11) NOT NULL,  
`Username` varchar(64) NOT NULL,   `Email` varchar(64) NOT NULL,  
`Password` varchar(64) NOT NULL,   `FailedAttemptCount` int(2) NOT
NULL,   `LastLogin` datetime NOT NULL,   `UserLevel` int(1) NOT NULL, 
`IsVerified` int(1) NOT NULL DEFAULT '0',   `VerificationKey`
varchar(256) NOT NULL,   `VerifiKeyCreated` datetime NOT NULL,  
PRIMARY KEY (`Id`),   FOREIGN KEY (`Id`) REFERENCES users.Id,   UNIQUE
KEY `username` (`Username`),   UNIQUE KEY `Email` (`Email`) )
ENGINE=InnoDB DEFAULT CHARSET=latin1;

我想添加一个外键,即 login.Id 引用 users.Id,但我在 phpmyadmin 中遇到错误(代码 150)。

在此先感谢您的帮助!

此致, 拉吉

应该是

REFERENCES `users`(`Id`)

而不是

REFERENCES users.Id

比照。 http://dev.mysql.com/doc/refman/5.6/en/create-table-foreign-keys.html