Question

请您告诉我我的外键有什么问题吗？我有MySQl脚本，但是最后，在创建Authorizations表时，我得到了以下信息：

Error 1215: Cannot add foreign key constraints

这是我的表的代码：

CREATE TABLE IF NOT EXISTS ProfilePublicData
(
    idProfile INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
    login VARCHAR(64),
    name VARCHAR(45),
    lastName VARCHAR(45),
    location VARCHAR(45),
    age TINYINT,
    photo VARCHAR(45),
    PRIMARY KEY(idProfile)
);

CREATE TABLE IF NOT EXISTS ProfilePrivateData
(
    idProfile INT(11) UNSIGNED NOT NULL,
    CONSTRAINT fkIdProfile 
            FOREIGN KEY(idProfile) 
            REFERENCES `ProfilePublicData`(idProfile)
                ON DELETE CASCADE 
                ON UPDATE CASCADE, 
    email VARCHAR(45),
    password VARCHAR(45),
    PRIMARY KEY(idProfile)
);
CREATE  TABLE IF NOT EXISTS Authorizations
(
    idAuthorization INT(11) UNSIGNED NOT NULL PRIMARY KEY,
    email VARCHAR(45) NOT NULL,
    CONSTRAINT fkPrivateDataProfile
            FOREIGN KEY(email) 
            REFERENCES `ProfilePrivateData`(email)            
                ON DELETE CASCADE 
                ON UPDATE CASCADE, 
     systemStatus ENUM ('ONLINE','OFFLINE','DELETED'),
    `dateTimeStart` DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
    `dateTimeRequest` DATETIME
);

Answer 1

这是由于电子邮件所致，因为电子邮件不是主键的一部分，请尝试删除电子邮件并再次测试代码。这部分是我的意思：

CREATE  TABLE IF NOT EXISTS Authorizations
(
    idAuthorization INT(11) UNSIGNED NOT NULL PRIMARY KEY,
    email VARCHAR(45) NOT NULL,
    CONSTRAINT fkPrivateDataProfile
            FOREIGN KEY(email) 
            REFERENCES `ProfilePrivateData`(email)            
                ON DELETE CASCADE 
                ON UPDATE CASCADE, 
     systemStatus ENUM ('ONLINE','OFFLINE','DELETED'),
    `dateTimeStart` DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
    `dateTimeRequest` DATETIME
);

无法添加外键约束，Mysql错误1215

1 个答案: