Question

每当我尝试在表格中插入外键时，我都会收到该消息：

错误代码：1215。无法添加外键约束0.281秒

我的创建表格代码：

CREATE TABLE `test`.`buy`(
    `id` INT NOT NULL AUTO_INCREMENT,
    `id_customer` INT UNSIGNED NOT NULL,
    `code` VARCHAR(45) NOT NULL,
    PRIMARY KEY(`id`),
    UNIQUE INDEX `code_UNIQUE`(`code`),
    CONSTRAINT `id_customer` FOREIGN KEY(`id_customer`) REFERENCES `test`.`customer`(`id_customer`) ON DELETE RESTRICT ON UPDATE CASCADE,
    CONSTRAINT `code` FOREIGN KEY(`code`) REFERENCES `test`.`product`(`code`) ON DELETE RESTRICT ON UPDATE CASCADE
)

我该怎么办？

Answer 1

请在下次格式化您的代码，以便更容易阅读。

您不需要CONSTRAINT xxx位，请尝试此操作：

CREATE TABLE test.buy (
  id INT NOT NULL AUTO_INCREMENT,
  id_customer INT UNSIGNED NOT NULL,
  code VARCHAR(45) NOT NULL,
  PRIMARY KEY (id),
  UNIQUE INDEX code_UNIQUE (code),
  FOREIGN KEY (id_customer) 
    REFERENCES test.customer (id_customer) 
    ON DELETE RESTRICT ON UPDATE CASCADE,
  FOREIGN KEY (code) 
    REFERENCES test.product (code) 
    ON DELETE RESTRICT ON UPDATE CASCADE
);

如果仍然不起作用，请确保您引用的其他表（test.customer和test.product）已存在，并且它们具有相同数据类型的匹配字段。

添加外键约束时出错

1 个答案: