title: How can I summarize a table in Power BI and give me a list of the summarized column
body: <p>In PowerBI, I create a summary table by using summarizecolumns() function on a Table called <code>Orders</code>,</p>
  <pre><code>Summary = summarizecolumns('Orders'[month], &quot;month&quot;, sum('Order'[day]))
  </code></pre>
  <p>My Orders table looks like</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>month</th>
  <th>day</th>
  <th>ids</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>jan</td>
  <td>1</td>
  <td>34</td>
  </tr>
  <tr>
  <td>jan</td>
  <td>15</td>
  <td>32</td>
  </tr>
  <tr>
  <td>feb</td>
  <td>16</td>
  <td>23</td>
  </tr>
  <tr>
  <td>feb</td>
  <td>13</td>
  <td>32</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>I would like the summary table to look lik</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>month</th>
  <th>day</th>
  <th>ids</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>jan</td>
  <td>16</td>
  <td>34, 32</td>
  </tr>
  <tr>
  <td>feb</td>
  <td>29</td>
  <td>23, 32</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>How can add a new column <code>ids</code> for showing the list of id getting summarized?</p>
  <p>Thank you.</p>