select e.emp_no,a1.l_salary-a1.f_salary as growth from employees e inner join (select s1.emp_no as emp_no, s1.salary as f_salary, s2.salary as l_salary, s2.to_date as to_date from salaries s1 inner join salaries s2 on s1.to_date=s2.from_date ) as a1 on e.emp_no = a1.emp_no and a1.to_date='9999-01-01'order by growth asc
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