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Employees表和Departments表的定义如下: Employees表: Column Datatype Constraint Emp_id int Primary Key Emp_name varchar Not null Salary int Check (salary between 1000 and 12000) Designamtion varchar Not null Detpartment_id int References Departments(Dept_id) Departments表: Column Datatype Constraint Dept_id int Primary Key Dept_name varchar Not null Location varchar Not null Detpartment_id Number References Departments(Dept_id) 你想删除部门号为30的部门信息,执行以下SQL语句: mysql> delete from Departments where dept_id=30; 产生错误, 你可以通过以下哪个操作解决这个错误?