求解思路:利用max函数找出最大值maxSalary,再以此作为条件查找不等于最大值且是余下的最大值即为次大值。 select e.emp_no, salary, last_name, first_name from employees e, salaries s where e.emp_no = s.emp_no and salary = ( select max(salary) secondSalary from salaries where salary != ( select max(salary) maxSalary from sala...