Mysql 错误1215:无法添加外键约束

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错误1215： 无法在我的sql脚本上添加外键约束

我已经检查了关于这个问题的另一个问题，答案总是你必须设置相同的类型

嗯，外键的类型是相同的，但是我得到了这个错误

以下是我的sql脚本的代码：

CREATE DATABASE IF NOT EXISTS CarLoan;

USE CarLoan;


CREATE TABLE IF NOT EXISTS `CarLoan`.`sede` (
`id_sede` INT NOT NULL,
`nome` VARCHAR(45) NOT NULL,
`citta` VARCHAR(45) NOT NULL,
`via` VARCHAR(45) NOT NULL,
`telefono` VARCHAR(9) NULL,
PRIMARY KEY (`id_sede`))
ENGINE = InnoDB;


CREATE TABLE IF NOT EXISTS `CarLoan`.`impiegato` (
`cf` CHAR(16) NOT NULL,
`nome` VARCHAR(45) NOT NULL,
`cognome` VARCHAR(45) NOT NULL,
`id_sede` INT NOT NULL,
`mail` VARCHAR(45) NOT NULL,
`password` VARCHAR(45) NOT NULL,
PRIMARY KEY (`cf`),
INDEX `id_sede_idx` (`id_sede` ASC),
  FOREIGN KEY (`id_sede`)
REFERENCES `CarLoan`.`sede` (`id_sede`)
ON DELETE CASCADE
ON UPDATE CASCADE)
ENGINE = InnoDB;

 CREATE TABLE IF NOT EXISTS `CarLoan`.`direttore` (
`cf` CHAR(16) NOT NULL,
`nome` VARCHAR(45) NOT NULL,
`cognome` VARCHAR(45) NOT NULL,
`id_sede` INT NOT NULL,
 `mail` VARCHAR(45) NOT NULL,
`password` VARCHAR(45) NOT NULL,
PRIMARY KEY (`cf`),
INDEX `id_sede_idx` (`id_sede` ASC),
FOREIGN KEY (`id_sede`)
REFERENCES `CarLoan`.`sede` (`id_sede`)
ON DELETE CASCADE
ON UPDATE CASCADE)
ENGINE = InnoDB;

---

我不知道你为什么会有这个错误，但在我看来，没关系，日志如下：

sql> CREATE DATABASE IF NOT EXISTS CarLoan
[2015-11-02 19:59:40] 1 row(s) affected in 6ms


sql> USE CarLoan
[2015-11-02 19:59:40] completed in 3ms


sql> CREATE TABLE IF NOT EXISTS `CarLoan`.`sede` (
  `id_sede` INT NOT NULL,
  `nome` VARCHAR(45) NOT NULL,
  `citta` VARCHAR(45) NOT NULL,
  `via` VARCHAR(45) NOT NULL,
  `telefono` VARCHAR(9) NULL,
  PRIMARY KEY (`id_sede`))
  ENGINE = InnoDB


[2015-11-02 19:59:41] completed in 725ms


sql> CREATE TABLE IF NOT EXISTS `CarLoan`.`impiegato` (
  `cf` CHAR(16) NOT NULL,
  `nome` VARCHAR(45) NOT NULL,
  `cognome` VARCHAR(45) NOT NULL,
  `id_sede` INT NOT NULL,
  `mail` VARCHAR(45) NOT NULL,
  `password` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`cf`),
  INDEX `id_sede_idx` (`id_sede` ASC),
  FOREIGN KEY (`id_sede`)
  REFERENCES `CarLoan`.`sede` (`id_sede`)
    ON DELETE CASCADE
    ON UPDATE CASCADE)
  ENGINE = InnoDB


[2015-11-02 19:59:42] completed in 748ms


sql> CREATE TABLE IF NOT EXISTS `CarLoan`.`direttore` (
  `cf` CHAR(16) NOT NULL,
  `nome` VARCHAR(45) NOT NULL,
  `cognome` VARCHAR(45) NOT NULL,
  `id_sede` INT NOT NULL,
  `mail` VARCHAR(45) NOT NULL,
  `password` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`cf`),
  INDEX `id_sede_idx` (`id_sede` ASC),
  FOREIGN KEY (`id_sede`)
  REFERENCES `CarLoan`.`sede` (`id_sede`)
    ON DELETE CASCADE
    ON UPDATE CASCADE)
  ENGINE = InnoDB


[2015-11-02 19:59:42] completed in 472ms

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您的代码很好，只需尝试任何不存在此db的测试服务器并还原输出…请将输出缩进四个空格，使其成为代码视图，这样更易于阅读。