mysql - 将字符串添加到 select 语句以包含在结果集中

Question

我正在尝试向 mysql 结果集添加一个字符串，以便稍后使用 php 操作结果。

这是我想做的，但它给了我一个错误。

SELECT 'new' AS condition
    UNION
SELECT p.Name AS title, p.meta_desc AS description, p.product_Id AS id from products AS p

我能做到:

SELECT p.Name AS title, p.meta_desc AS description, p.product_Id AS id, 'new' from products AS p

但它给出了 new => new ，理想情况下我希望结果列被称为 'descripiton' 并检索 'condition' => 'new'

Answer 1

SELECT p.Name AS title, 
       p.meta_desc AS description, 
       p.product_Id AS id, 
       'new' AS `condition`
FROM products AS p

您可以为文字添加别名。 Condition是一个保留字，所以你必须使用反引号。