3
我能做到这一点:SQL处理值
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?
我能做到这一点:SQL处理值
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?
你可以这样做:
SELECT one, two, (one+two) as three
FROM
(
SELECT
1 AS one
2 AS two
) t;
的方法是这样的:
SELECT one, two, one + two AS 'three'
FROM (SELECT 1 as 'one', 2 as 'two') myTable
我太慢了。 – OCary
+1是的,这是要走的路 - 没有一个子查询或CTE,一个**不能**在同一个SELECT中使用列别名 –
谢谢,我之前尝试过,但我的问题变成了另一种:我的父查询有几个连接,我的“一个”和“两个”列是使用这些值的子选择连接。这意味着我将不得不在这个SELECT中作为一个表格进行连接。感谢marc_s btw的解释! – taff