Order from subquery lost

CREATE TABLE `_article2category` (

	`category_id` INT

);

INSERT INTO `_article2category` (`category_id`) VALUES

(2), (1);

SELECT

	Sub.category_id

FROM 

(

	SELECT 

		A2C.category_id

	FROM 

		_article2category A2C

	ORDER BY 

		A2C.category_id ASC

) Sub;

DROP TABLE _article2category;