可以用两个join:SELECT s1.emp_no,s1.salary-s2.salary AS growth FROM salaries s1 JOIN salaries s2 ON s1.emp_no=s2.emp_no JOIN employees e ON s2.from_date=e.hire_date AND s2.emp_no=e.emp_no WHERE s1.to_date='9999-01-01' ORDER BY growth
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