WordPress query posts by page id

It is very simple just use page_id argument and pass the page_id to query post.

<?php 
query_posts('page_id=11'); 
while (have_posts ()): the_post(); 
?> 
<h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2> 
<?php the_content(); ?> 
<?php endwhile; ?>

 

Thanks