排序一列中兩個列

Question

假設我有一個表 - 個人

id | First Name | Last Name 
-----------------------------' 
1 AA    BB 
2 EE    DD 
3 CC    FF 

在這裏，我想在1列中顯示的名字和姓氏。

Such that output would be 
---------------------- 
AA 
BB 
CC 
DD 
EE 
FF 

Can i also display it as 
------------------ 
1 AA 
1 BB 
3 CC 
2 DD 
2 EE 
3 FF 

使用Mysql查詢？

Answer 1

您正在尋找union all：

select first_name as name from persons union all 
select last_name from persons 
order by name; 

編輯：

對於修訂後的問題：

select id, first_name as name from persons union all 
select id, last_name from persons 
order by name; 

Answer 2

如果您想根據id的結果進行排序。然後，

查詢

select t.name from(
    select id, firstname as name 
    from tblPersons 
    union all 
    select id, lastname as name 
    from tblPersons 
)t 
order by t.id, t.name; 

Answer 3

select * from 
(
select first_name from person 

union 

select last_name from person 
) 
t 
order by first_name