title: Select from Firebase database using more than one where conditions
body: <p>In Firebase database I have a list of <strong>Bookings</strong>.</p>
  
  <p>Each <strong>Booking</strong> as the following structure</p>
  
  <pre><code>{
     userUid: string,
     status: string,
     moreStuff: {
       ....
     }
  }
  </code></pre>
  
  <p>I need to select all the bookings associated to a certain user (i.e. whose <em>userUid</em> is equal to the <em>uid</em> of the user, which is known by by app) which have a certain status (e.g. <code>status = confirmed</code>).</p>
  
  <p>I can select the Bookings belonging to a specific user using the following query</p>
  
  <pre><code>db.list('bookings', {
          query: {
              orderByChild: 'userUid',
              equalTo: user.uid
          }
      })
  </code></pre>
  
  <p>but I have no idea if I can add the additional select condition e.g. <code>status = confirmed</code></p>