如何为 MySQL 中的字段或列设置别名?

How to alias a field or column in MySQL?(如何为 MySQL 中的字段或列设置别名?)

问题描述

我正在尝试做这样的事情.但我得到一个未知的列错误:

I'm trying to do something like this. But I get an unknown column error:

SELECT SUM(field1 + field2) AS col1, col1 + field3 AS col3 from core

基本上，我只想使用别名，这样我就不需要执行之前执行的操作.这在mysql中可以吗?

Basically, I want to just use the alias so that I won't need to perform the operations performed earlier. Is this possible in mysql?

推荐答案

考虑使用子查询，例如:

Consider using a subquery, like:

SELECT col1
,      col1 + field3 AS col3 
FROM   (
       SELECT  field1 + field2 as col1
       ,       field3
       from    core
       ) as SubQueryAlias

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