摘要：
select A.*,B.dept_no from salaries A,dept_manager B where A.emp_no=B.emp_no and A.to_date='9999-01-01' AND B.to_date='9999-01-01' order by A.emp_no 阅读全文
摘要：
select * from employees where hire_date = (select distinct hire_date from employees order by hire_date desc limit 1 offset 2) 阅读全文