title: How to use "equalTo" with list of values in Firebase?
body: <p>I have some data</p>
  
  <pre><code>{
    "1": {
      "result": 303
    },
    "2": {
      "result": 307
    },
    "3": {
      "result": 703
    },
    "4": {
      "result": 909
    },
    "5": {
      "result": 909
    }
  }
  </code></pre>
  
  <p>So I can get <em>result</em> field of <em>3</em> key:</p>
  
  <pre><code>ref.child("3").once("value", (snapshot) =&gt; {
    const data = snapshot.val();
    console.log(data.result);
  });
  </code></pre>
  
  <p>But I want to get array of <em>result</em>s of <em>3</em>, <em>4</em>, <em>5</em> keys in one query. How can I do this?</p>