select b.emp_no, c.salary - b.salary as growth #作差即为变化 from( select e.emp_no, s1.salary from salaries s1 join employees e on s1.emp_no = e.emp_no where s1.from_date = e.hire_date)b #先找出入职时的工资是多少,有hire_date很容易 join (select emp_no, salary from (select emp_no, salary,...