题解 | #SQL21 查找在职员工自入职以来的薪水涨幅情况#

select t1.emp_no, t2.salary - t1.salary growth 
from 
    (select e.emp_no, s.salary 
    from employees e 
    left join salaries s on e.hire_date = s.from_date) t1
inner join 
    (select s.emp_no, s.salary
    from salaries s where s.to_date = '9999-01-01') t2
on t1.emp_no = t2.emp_no
order by growth