＃1022 - 不能写;表中的重复键

Question

嗨，我在mysql phpMyAdmin中创建表时出现1022错误。 错误发生在最后一个表“usercoment”：

解决方案编辑：好的，我已经有一个名为IdMovie的约束键，所以我重命名并且工作正常。 谢谢你们。

以下是表格：

CREATE TABLE IF NOT EXISTS `WhichMovie`.`UserComent` (
  `IDComent` INT NOT NULL,
  `IDUser` INT NOT NULL,
  `IDMovie` INT NOT NULL,
  `date` TIMESTAMP NOT NULL,
  PRIMARY KEY (`IDComent`, `IDUser`, `IDMovie`, `date`),
  INDEX `idUser_idx` (`IDUser` ASC),
  INDEX `idMovie_idx` (`IDMovie` ASC),
  CONSTRAINT `IdComent`
    FOREIGN KEY (`IDComent`)
    REFERENCES `WhichMovie`.`Coment` (`idComent`)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT `IiUser`
    FOREIGN KEY (`IDUser`)
    REFERENCES `WhichMovie`.`User` (`idUser`)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT `IdMovie`
    FOREIGN KEY (`IDMovie`)
    REFERENCES `WhichMovie`.`Movie` (`idMovie`)
    ON DELETE CASCADE
    ON UPDATE CASCADE)
ENGINE = InnoDB;

-- -----------------------------------------------------
-- Table `WhichMovie`.`Movie`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `WhichMovie`.`Movie` (
  `idMovie` INT NOT NULL AUTO_INCREMENT,
  `Ttle` VARCHAR(45) NULL,
  `Year` INT NULL,
  `Country` VARCHAR(45) NULL,
  `Poster` BLOB NULL,
  `Rating` DECIMAL NULL,
  PRIMARY KEY (`idMovie`))
ENGINE = InnoDB;

-- -----------------------------------------------------
-- Table `WhichMovie`.`User`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `WhichMovie`.`User` (
  `idUser` INT NOT NULL AUTO_INCREMENT,
  `Username` VARCHAR(45) NOT NULL,
  `Email` VARCHAR(45) NOT NULL,
  `Country` VARCHAR(45) NULL,
  `Pass` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`idUser`, `Username`, `Email`),
  UNIQUE INDEX `idUser_UNIQUE` (`idUser` ASC),
  UNIQUE INDEX `Email_UNIQUE` (`Email` ASC),
  UNIQUE INDEX `Username_UNIQUE` (`Username` ASC))
ENGINE = InnoDB;

-- -----------------------------------------------------
-- Table `WhichMovie`.`Coment`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `WhichMovie`.`Coment` (
  `idComent` INT NOT NULL AUTO_INCREMENT,
  `NameComent` VARCHAR(45) NULL,
  PRIMARY KEY (`idComent`),
  UNIQUE INDEX `idComent_UNIQUE` (`idComent` ASC))
ENGINE = InnoDB;

有人能看到吗？

Answer 1

根据：MySQL error 1022 when creating table您不能在整个模型上复制外键约束名称。

Answer 2

只需重命名约束名称不同，您的问题就解决了......

示例：

 CONSTRAINT `IdComent_CONSTRAINT`
    FOREIGN KEY (`IDComent`)

现在你有一个与THE FOREIGN KEY ONE不同的CONSTRAINT'NAME

Answer 3

您使用的是哪个版本的MySQL？

在我的本地主机上使用MySQL 5.6.12这段代码（与你的相同，但最后移动了UserComent的创建）可以正常工作：

-- -----------------------------------------------------
-- Table `WhichMovie`.`Movie`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `WhichMovie`.`Movie` (
  `idMovie` INT NOT NULL AUTO_INCREMENT,
  `Ttle` VARCHAR(45) NULL,
  `Year` INT NULL,
  `Country` VARCHAR(45) NULL,
  `Poster` BLOB NULL,
  `Rating` DECIMAL NULL,
  PRIMARY KEY (`idMovie`))
ENGINE = InnoDB;

-- -----------------------------------------------------
-- Table `WhichMovie`.`User`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `WhichMovie`.`User` (
  `idUser` INT NOT NULL AUTO_INCREMENT,
  `Username` VARCHAR(45) NOT NULL,
  `Email` VARCHAR(45) NOT NULL,
  `Country` VARCHAR(45) NULL,
  `Pass` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`idUser`, `Username`, `Email`),
  UNIQUE INDEX `idUser_UNIQUE` (`idUser` ASC),
  UNIQUE INDEX `Email_UNIQUE` (`Email` ASC),
  UNIQUE INDEX `Username_UNIQUE` (`Username` ASC))
ENGINE = InnoDB;

-- -----------------------------------------------------
-- Table `WhichMovie`.`Coment`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `WhichMovie`.`Coment` (
  `idComent` INT NOT NULL AUTO_INCREMENT,
  `NameComent` VARCHAR(45) NULL,
  PRIMARY KEY (`idComent`),
  UNIQUE INDEX `idComent_UNIQUE` (`idComent` ASC))
ENGINE = InnoDB;




CREATE TABLE IF NOT EXISTS `WhichMovie`.`UserComent` (
  `IDComent` INT NOT NULL,
  `IDUser` INT NOT NULL,
  `IDMovie` INT NOT NULL,
  `date` TIMESTAMP NOT NULL,
  PRIMARY KEY (`IDComent`, `IDUser`, `IDMovie`, `date`),
  INDEX `idUser_idx` (`IDUser` ASC),
  INDEX `idMovie_idx` (`IDMovie` ASC),
  CONSTRAINT `IdComent`
    FOREIGN KEY (`IDComent`)
    REFERENCES `WhichMovie`.`Coment` (`idComent`)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT `IiUser`
    FOREIGN KEY (`IDUser`)
    REFERENCES `WhichMovie`.`User` (`idUser`)
    ON DELETE CASCADE
    ON UPDATE CASCADE,
  CONSTRAINT `IdMovie`
    FOREIGN KEY (`IDMovie`)
    REFERENCES `WhichMovie`.`Movie` (`idMovie`)
    ON DELETE CASCADE
    ON UPDATE CASCADE)
ENGINE = InnoDB;

创建表，不会发生错误。

在5.6.15表上也创建没有问题。在phpmyadmin设计师的视图下方：