Question

我看过其他论坛，包括有关此错误的帖子，但在我的情况下似乎找不到原因。数据类型，排序规则，零填充，非null，无符号和二进制类型都匹配，但我仍然无法提出解决方案。我收到的输出如下：

错误：ERROR: Error 1822: Failed to add the foreign key constraint. Missing index for constraint 'fk_projects_has_equipment_equipment1' in the referenced table 'equipment'

我还包括了设备表。任何帮助将不胜感激。

代码：

  CREATE TABLE IF NOT EXISTS `Group_13_Schema`.`project_equipment` (
      `project_id` INT NOT NULL,
      `vendor_id` INT NOT NULL,
      `department_id` INT NOT NULL,
      `equipment_id` INT NOT NULL,
      `equipment_cost` DECIMAL(10,2) NULL,
      PRIMARY KEY (`department_id`, `equipment_id`, `project_id`, `vendor_id`),
      INDEX `fk_projects_has_equipment_equipment1_idx` (`vendor_id` ASC, `department_id` ASC, `equipment_id` ASC) VISIBLE,
      INDEX `fk_projects_has_equipment_projects1_idx` (`project_id` ASC) VISIBLE,
      CONSTRAINT `fk_projects_has_equipment_projects1`
        FOREIGN KEY (`project_id`)
        REFERENCES `Group_13_Schema`.`projects` (`project_id`)
        ON DELETE NO ACTION
        ON UPDATE NO ACTION,
      CONSTRAINT `fk_projects_has_equipment_equipment1`
        FOREIGN KEY (`vendor_id` , `department_id` , `equipment_id`)
        REFERENCES `Group_13_Schema`.`equipment` (`vendor_id` , `department_id` , `equipment_id`)
        ON DELETE NO ACTION
        ON UPDATE NO ACTION)
    ENGINE = InnoDB



CREATE TABLE IF NOT EXISTS `Group_13_Schema`.`equipment` (
  `equipment_id` INT NOT NULL,
  `vendor_id` INT NOT NULL,
  `department_id` INT NOT NULL,
  `equipment_name` VARCHAR(45) NULL,
  `equipment_cost` DECIMAL(10,2) NULL,
  PRIMARY KEY (`equipment_id`, `vendor_id`, `department_id`),
  INDEX `fk_departments_has_vendors_vendors1_idx` (`vendor_id` ASC) VISIBLE,
  INDEX `fk_departments_has_vendors_departments1_idx` (`department_id` ASC) VISIBLE,
  CONSTRAINT `fk_departments_has_vendors_departments1`
    FOREIGN KEY (`department_id`)
    REFERENCES `Group_13_Schema`.`departments` (`department_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_departments_has_vendors_vendors1`
    FOREIGN KEY (`vendor_id`)
    REFERENCES `Group_13_Schema`.`vendors` (`vendor_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_projects_has_equipment_equipment1`
    FOREIGN KEY (`equipment_id`)
    REFERENCES `Group_13_Schema`.`equipment` (`vendor_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

Answer 1

尝试为3个FK列创建索引。我希望PK已经合格，但是最后2列的顺序与FK约束中列出的顺序相反。

前向工程EER图产生错误1882

1 个答案: