title: GROUP_CONCAT ORDER BY
body: <p>I've <a href="http://googledrive.com/host/0B53jM4a9X2fqfkhfeV83Tm05VnU4cV9ZSWZlMUNTQzRZUUJQTFdQZUptOEJkdXkyVXFIYmM" rel="noreferrer">a table</a> like:</p>
  
  <pre><code>+-----------+-------+------------+
  | client_id | views | percentage |
  +-----------+-------+------------+
  |         1 |     6 |         20 |
  |         1 |     4 |         55 |
  |         1 |     9 |         56 |
  |         1 |     2 |         67 |
  |         1 |     7 |         80 |
  |         1 |     5 |         66 |
  |         1 |     3 |         33 |
  |         1 |     8 |         34 |
  |         1 |     1 |         52 |
  </code></pre>
  
  <p>I tried <code>group_concat</code>:</p>
  
  <pre><code>SELECT li.client_id, group_concat(li.views) AS views,  
  group_concat(li.percentage) FROM li GROUP BY client_id;
  
  +-----------+-------------------+-----------------------------+
  | client_id | views             | group_concat(li.percentage) |
  +-----------+-------------------+-----------------------------+
  |         1 | 6,4,9,2,7,5,3,8,1 | 20,55,56,67,80,66,33,34,52  |
  +-----------+-------------------+-----------------------------+
  </code></pre>
  
  <p>But I want to get the views in order, like:</p>
  
  <pre><code>+-----------+-------------------+----------------------------+
  | client_id | views             | percentage                 |
  +-----------+-------------------+----------------------------+
  |         1 | 1,2,3,4,5,6,7,8,9 | 52,67,33,55,66,20,80,34,56 |
  +-----------+-------------------+----------------------------+
  </code></pre>