Firebase remove node based on child value
<p>I want to delete the entire node by query like delete * WHERE user_id = "-KTruPWrYO9WFj-TF8Ft" How can I achieve this on firebase?</p>

<pre><code>-KVpQFXnzQkzzrowHxGk
  answer: "1"
  question_number: 2
  user_id: "-KTruPWrYO9WFj-TF8Ft"
-KVpQFXODhsAMJYFNjy7
  answer: "4"
  question_number: 25
  user_id: "-KTruPWrYO9WFj-TF8Ft"
</code></pre>