Question

我需要一些关于sql查询的帮助：

我有一个包含以下值4列的表：

Emp_Id, Emp_Name, Dept_Id, Join_Date, Salary
1, John, A, 20170101, 50000
2, David, B, 20160201, 60000
1, John, A, 20170606, 60000

如果员工属于部门＆＃39; A＆＃39;什么是最新的工资，如果员工在部门B，最早的薪水是多少。

尝试做这样的其他事情，但是如果员工在1个以上的部门工作，那么就不会重复工作

select salary,emp_id,join_date from employee
where emp_id in (select emp_id from employee where dept = 'A') 
group by emp_id 
having join_date = max(join_date)
union
select salary,emp_id,join_date from employee
where emp_id in (select emp_id from employee where dept != 'A') 
group by emp_id 
having join_date = min(join_date)

感谢帮助

Answer 1

SELECT Salary, Emp_Id, Emp_Name, Dept_Id, Join_Date
  FROM employee
 WHERE Dept_Id   = 'A'
   AND Join_Date = ( SELECT MAX(Join_Date)
                       FROM employee
                      WHERE Dept_Id   = 'A'
                   )
UNION ALL
SELECT Salary, Emp_Id, Emp_Name, Dept_Id, Join_Date
  FROM employee
 WHERE Dept_Id   = 'B'
   AND Join_Date = ( SELECT MIN(Join_Date)
                       FROM employee
                      WHERE Dept_Id   = 'B'
                   )

根据SQL中列的值获取sql中的最大或最小日期

1 个答案: