sql 查询中 非主键不能相同的问题。帮忙解决非常感谢。

员工表结构：
id (唯一), name , organ(机构), branch(部门)，ordernumber(订单)
001 张三 北京 财务 20
005 李四 北京 财务 42
007 赵六 上海 财务 56

订单大于10的，这三条都符合条件，但是要求查询结果中，同一个机构部门也不能重复。也就是张三、李四只能取其中一个，怎么去都成。例如结果是：
001 张三 北京 财务 20
007 赵六 上海 财务 56

求高手解决啊。谢谢了

SELECT * FROM 表 where id IN(SELECT max(id) AS id FROM 表 where ordernumber>10 group by organ,branch)

SQL code

select t.* from tb t where ordernumber = 10 and id = (select min(id) from tb where organ = t.organ and branch = t.branch and ordernumber = 10) 

select t.* from tb t where ordernumber = 10 and id = (select max(id) from tb where organ = t.organ and branch = t.branch and ordernumber = 10) 

select t.* from tb t where ordernumber = 10 and not exists (select 1 from tb where organ = t.organ and branch = t.branch and ordernumber = 10 and id < t.id)
 
select t.* from tb t where ordernumber = 10 and not exists (select 1 from tb where organ = t.organ and branch = t.branch and ordernumber = 10 and id > t.id)