这样为什么不对啊? select s2.emp_no,(s1.salary-s2.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 where e.hire_date=s.from_date)s2 inner join (select s.emp_no,s.salary from salaries as s where s.to_date="9999-01-01")s1 on s1.emp_no=s2.emp_no
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