这并不是一个好方法,且该方法仅适用于此题的测试用例,发出来仅作分享使用,逗大家乐乐 select (select emp_no from salaries where to_date = '9999-01-01'), (select (select salary from salaries where to_date = '9999-01-01') -( select salary from salaries where emp_no in (select emp_no from salaries where to_date = '9999-01-01') and from_date = ...