select * from f_articles ar,f_authors a WHERE ar.art_user_id=a.aut_id AND ar.art_featured='Y' and ar.art_rss='N' and ar.art_status='A' ORDER by ar.art_id DESC LIMIT 5

其中a.aut_id art_user_id已加索引

6万多条数据,用时13秒,快晕了