MySQL Workbench。错误 1452：无法添加或更新子行：外键约束失败。手术失败

Question

我无法通过外键绑定下属（Table管理员）和主要table（部门）。它显示以下消息：

正在执行：

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

栏目名称："id_department"table"Department"有：

数据类型 - INT(10)
存储：主键、非空、唯一、无符号、自动递增。

栏目名称："id_department"table"Administrator"有：

数据类型 - INT(10)
存储：非空，未签名。

Answer 1

确保 table 中的当前数据满足您添加的限制条件。看起来您的管理员的部门 ID 无效。

MySQL Workbench。错误 1452：无法添加或更新子行：外键约束失败。手术失败

MySQL Workbench. ERROR 1452: Cannot add or update a child row: a foreign key constraint fails. Operation failed

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