Question

如果我运行此代码一切正常，但如果取消注释最后一个约束，我收到以下错误：

错误代码：1022。不能写;表格中的重复键＆＃39;转移＆＃39;

但没有其他密钥＆＃39; fk_component_id＆＃39;，这段代码有什么问题？

-- -----------------------------------------------------
-- Table `pcdb`.`transfer`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `pcdb`.`transfer` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `component_id` INT UNSIGNED NOT NULL,
  `type` INT NULL,
  `parent_id` INT UNSIGNED NULL,
  `source_id` INT UNSIGNED NULL,
  `contractor_id` INT UNSIGNED NULL,
  `src_department_id` INT UNSIGNED NULL,
  `dest_department_id` INT UNSIGNED NULL,
  `session_id` INT UNSIGNED NOT NULL,
  `count` INT UNSIGNED NOT NULL,
  `comment` TEXT(65535) NULL,
  `active` TINYINT(1) NOT NULL DEFAULT 1,
  PRIMARY KEY (`id`),
  CONSTRAINT `fk_src_department_id`
    FOREIGN KEY (`src_department_id`)
    REFERENCES `pcdb`.`department` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_income_id`
    FOREIGN KEY (`source_id`)
    REFERENCES `pcdb`.`transfer` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION, 
  CONSTRAINT `fk_contractor_id`
    FOREIGN KEY (`contractor_id`)
    REFERENCES `pcdb`.`contractor` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_session_id`
    FOREIGN KEY (`session_id`)
    REFERENCES `pcdb`.`session` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_dest_department_id`
    FOREIGN KEY (`dest_department_id`)
    REFERENCES `pcdb`.`department` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_parent_id`
    FOREIGN KEY (`parent_id`)
    REFERENCES `pcdb`.`transfer` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION/*, 
  CONSTRAINT `fk_component_id`
    FOREIGN KEY (`component_id`)
    REFERENCES `pcdb`.`component` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION*/);

Answer 1

听起来您可能已在数据库中的其他表上使用该名称进行约束。尝试将该约束的名称更改为“fk_transfer_component_id”，并查看是否仍然出现错误。

MySQL重复键错误

1 个答案: