title: Fetch some (and not all) properties from a list in Firebase Realtime Database
body: <p>Suppose there is a list in my Realtime Database such that it has a user list at location <strong>userList</strong> as:</p>
  <pre><code>user1: { age: 20, name: john }
  
  user2 : { age: 40, name: sam }
  
  user3: { age: 30, name: cynthia }
  </code></pre>
  <p>Is there a way for me to write a query to fetch only the ages from the above <strong>userList</strong>?</p>
  <p>I am currently using Angular 11, and taking help of Angular Fire package to communicate with the Firebase database.</p>
  <p><em>Note: I have removed the apostrophes from the above example for clarity.</em></p>