求助PL/SQL问题accept no prompt ‘请输入雇员编号’;declareno emp.empno%type;rec emp%rowtype;beginselect empno into no from emp where empno=&no; --&no:从键盘输入select * into rec from emp where empno=&no;dbms_output.put_line(‘经理编号为:’||rec.mgr);dbms_output.put_line(‘经理编号为:’||rec.empno);end;还差第四步没有实现