查询109号员工的员工号，员工名，工资，使用记录类型变量的字段接收查询结果

declare
  v_emp employees%Rowtype;
begin
  select employeeid, firstname, salary
    into v_emp.employeeid, v_emp.firstname, v_emp.salary
    from employees
   where employeeid = 109;
  dbms_output.put_line(v_emp.employeeid || ' ' || v_emp.firstname || ' ' ||
                       v_emp.salary);
end;