SQL处理值

Question

我能做到这一点：

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

但我想这样做：

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

这可能吗？

Answer 1

你可以这样做：

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

Answer 2

的方法是这样的：

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