select s.emp_no,s.salary,last_name,first_name from employees e join salaries s using(emp_no) where s.emp_no=( select emp_no from salaries m where m.salary= ( select max(salary) from salaries where salary < (select max(salary) from salaries) and to_date='9999-01-01') ) 第一步,找出当前第二高的工资select max(s...