勿忘on条件，按emp_no排序
查找当前薪水详情以及部门编号dept_no
http://www.nowcoder.com/questionTerminal/c63c5b54d86e4c6d880e4834bfd70c3b
感觉这题目描述的不准确，看了讨论区才理解对。。
连接表达式写法
select s.*,d.dept_no from salaries as s inner join dept_manager as d on s.emp_no=d.emp_no where s.to_date='9999-01-01' and d.to_date='9999-01-01'
或者
select s.*,d.dept_no from salaries as s , dept_manager as d on s.emp_no=d.emp_no where s.to_date='9999-01-01' and d.to_date='9999-01-01'
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