title: Exclude ID column from ActiveRecord results
body: <p>AR statement:</p>
  
  <pre class="lang-rb prettyprint-override"><code>Phone.select(:number).distinct.where(in_black_list: true)
  </code></pre>
  
  <p>Results in following MySQL query:</p>
  
  <pre class="lang-sql prettyprint-override"><code>SELECT DISTINCT number FROM phones WHERE phones.in_black_list = 1
  </code></pre>
  
  <p>A result contains empty IDs:</p>
  
  <pre class="lang-none prettyprint-override"><code>#&lt;ActiveRecord::Relation [
    #&lt;Phone id: nil, number: "1234567"&gt;,
    #&lt;Phone id: nil, number: "78567459"&gt;,
    #&lt;Phone id: nil, number: "78567457"&gt;,
    #&lt;Phone id: nil, number: "998567946794567"&gt;,
  ]&gt;
  </code></pre>
  
  <p>How to eliminate these IDs?</p>