分别胜场当前的薪水表和入职的薪水表,注意因为只要当前的员工不包含已经离职的员工,所以两表应用INNER JOIN SELECT s_to.emp_no,(s_to.salary - s_from.salary) AS growth FROM (SELECT e.emp_no,s.salary FROM employees as e INNER JOIN salaries as s on e.emp_no = s.emp_no and s.to_date = '9999-01-01') AS s_to INNER JOIN (SELECT e.emp_no,s.salary FROM emplo...