数据库SQL实战 No.6
查找所有员工入职时候的薪水情况
http://www.nowcoder.com/questionTerminal/23142e7a23e4480781a3b978b5e0f33a
select e.emp_no, s.salary
from employees as e left join salaries as s
on e.emp_no = s.emp_no and e.hire_date = s.from_date
order by e.emp_no desc
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