SELECT
	* 
FROM
	`user` 
WHERE
	( `user`.id ) IN ( SELECT article.user_id FROM article GROUP BY article.user_id ORDER BY COUNT( article.user_id ) DESC LIMIT 0, 3 )

即MySQL中in关键字不能和limit连用，即会报1235 - This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'的错误

要解决很简单，不让in关键字和limit关键字在一层上，把后面的子查询语句包起来，

SELECT
	* 
FROM
	`user` 
WHERE
	( `user`.id ) IN (
	SELECT
		a.user_id 
	FROM
		( SELECT article.user_id FROM article GROUP BY article.user_id ORDER BY COUNT( article.user_id ) DESC LIMIT 0, 3 ) AS a 
	)

 注意 是把后面查出来的数据当做一个新表，来多包一层，让in和limit没在一层。