將不同的列排序爲一個順序？

Question

我有這樣的桌子;

Student_Name1 mark1 Student_Name2 mark2 
-------------- ------ --------------- -------- 
Kevin   77  Peter   78 
Andrew   91  David   17 
Scott   46  Bradley  28 

我怎樣可以訂購在上表中mark1和mark2成包括所有的名稱和地點，所有一起降序排列，如下面？

Student_Name mark 
-------------- ------ 
Andrew   91 
Peter   78 
Kevin   77 
Scott   46 
Bradley   28 
David   17 

我使用MSSQL Server 2008 R2的

Answer 1

使用UNION ALL：

Select Student_Name1 As Student_Name, 
      Mark1   As Mark 
From  YourTable 
Union All 
Select Student_Name2 As Student_Name, 
      Mark2   As Mark 
From  YourTable 
Order By Mark Desc; 

Answer 2

這是一個奇怪的表的設計，但你可以使用UNION爲此，像

select * from (
select Student_Name1 as Student_Name, mark1 as mark from student 
union all 
select Student_Name2 , mark2 from student) xxx 
order by mark desc;