SQL處理值

Question

我能做到這一點：

SELECT 
    1 AS one, 
    2 AS two, 
    1 + 2 AS three; 

但我想這樣做：

SELECT 
    1 AS one, 
    2 AS two, 
one + two AS three; 

這可能嗎？

Answer 1

你可以這樣做：

SELECT one, two, (one+two) as three 
FROM 
(
    SELECT 
     1 AS one 
     2 AS two 
) t; 

Answer 2

的方法是這樣的：

SELECT one, two, one + two AS 'three' 
FROM (SELECT 1 as 'one', 2 as 'two') myTable