我正在尝试更新employee表employee\u 1的employee\u id列，以获取employee表employee\u id列的前151行。但是employee\u 1表employee\u id列的所有行都升级为employee表employee的employee\u id列的一个行值。
使用的代码是：

declare

            cursor c1 is select employee_id from employees;
            emp_id employees.employee_id%type;
        Begin
          open c1;
            loop 
              fetch c1 into emp_id;
              exit when(c1%rowcount>151);
              update employee_1 set employee_id=emp_id;
           end loop;
          close c1;
        end;

How to update the column with different values?