Query pulling in Inherited posts

Hello,

I am currently trying to pull in certain posts with a publish status, I am having problems trying to get it to only post the posts that are the update version and not the 4 other revisions which accompany it.

here is my code

$querystr = "
    SELECT $wpdb->posts.*
    FROM $wpdb->posts, $wpdb->postmeta
    WHERE $wpdb->posts.ID = $wpdb->postmeta.post_id
	AND $wpdb->posts.post_status = 'publish'
    AND $wpdb->posts.post_type = 'post'
    AND $wpdb->posts.post_date < NOW()
    ORDER BY $wpdb->posts.post_date DESC
    LIMIT 8,4";
	";

When this query runs, it gives me posts which hold the status inherit.
Is there anyway of stopping this?

Thanks