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Employees表和Departments表的定义如下: Employees表: Column Datatype Constraint Emp_id Number Primary Key Emp_name varchar2 Not null Salary number Check (salary between 1000 and 12000) Designamtion varchar2 Not null Detpartment_id Number References Departments(Dept_id) Departments表: Column Datatype Constraint Dept_id Number Primary Key Dept_name varchar2 Not null Location varchar2 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: SQL> delete from Departments where dept_id=30; 产生如下错误: ERROR at line 1: ORA-02292:完整性约束(HR.SYS_C005375)验证-已找到子记录 你可以通过以下哪个操作解决这个错误?