Mine

SELECT * FROM wp_7_posts UNION (SELECT * FROM wp_6_posts) UNION (SELECT * FROM wp_3_posts) UNION (SELECT * FROM wp_5_posts) UNION (SELECT * FROM wp_4_posts) UNION (SELECT * FROM wp_2_posts) UNION (SELECT * FROM wp_1_posts) WHERE ID > 1 AND  post_status = 'publish' AND post_type = 'post' AND post_password = '' ORDER BY id DESC LIMIT 0,20