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我无法通过外键绑定下属（表管理员）和主表（部门）。它显示以下消息：

执行：

ALTER TABLE `grocery_supermarket_manager`.`administrator` 
ADD CONSTRAINT `AdministratorDepartment_FK`
  FOREIGN KEY (`id_department`)
  REFERENCES `grocery_supermarket_manager`.`department` (`id_department`)
  ON DELETE CASCADE
  ON UPDATE CASCADE;

操作失败：将 SQL 脚本应用到数据库时出错。

ERROR 1452: Cannot add or update a child row: a foreign key constraint fails (`grocery_supermarket_manager`.`#sql-9ac_8`, CONSTRAINT `AdministratorDepartment_FK` FOREIGN KEY (`id_department`) REFERENCES `department` (`id_department`) ON DELETE CASCADE ON UPDATE CASCADE)
SQL Statement:
ALTER TABLE `grocery_supermarket_manager`.`administrator` 
ADD CONSTRAINT `AdministratorDepartment_FK`
  FOREIGN KEY (`id_department`)
  REFERENCES `grocery_supermarket_manager`.`department` (`id_department`)
  ON DELETE CASCADE
  ON UPDATE CASCADE

列名：“id_department”表“部门”有：

  • 数据类型 - INT(10)
  • 存储：主键、非空、唯一、无符号、自动递增。

列名：“id_department”表“管理员”有：

  • 数据类型 - INT(10)
  • 存储：非空，无符号。
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1 回答 1

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确保表中的当前数据满足您添加的约束。看起来您的管理员的部门 ID 无效。

于 2016-12-13T08:43:07.463 回答