title: How to query and display data in listview.builder from other child of the root ref, using id in realtime database "Flutter"?
body: <p>I am having trouble displaying user and post data in a listview from the firebase real-time database.</p>
  <p><a href="https://i.stack.imgur.com/0OScx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0OScx.png" alt="image1" /></a></p>
  <p><a href="https://i.stack.imgur.com/dF9ud.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dF9ud.png" alt="image" /></a></p>
  <p><a href="https://i.stack.imgur.com/ONaXO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ONaXO.png" alt="image 3" /></a></p>
  <p>The above three are the images of a real-time database,</p>
  <p>From the above, I need to display all posts[tags], and using the host id from the post, I need to display user data along with posts in a listview.
  But I cannot use two different children of the same reference in the future builder.</p>
  <p>How to write the query for the above to display in Flutter listview.</p>
  <p>Thanking you in advance.</p>