怎么用CDbCriteria，把复杂sql语句写成这个形式 [ 新手入门 ]

SELECT *
		FROM `tbl_article`
		WHERE id
		IN (
		
		SELECT DISTINCT article_id
		FROM `tbl_article_sort`
		WHERE sort_id
		IN (
		
		SELECT id
		FROM `tbl_sort`
		WHERE sort_sort =1

怎么用CDbCriteria写