title: MYSQL request from two tables with FIND_IN_SET
body: <p>I have two tables (MySQL):</p>
  
  <ol>
  <li><p>table_products: // cid (text) - comma separated categories list // id (int11)</p>
  
  <pre><code>id   cid
  1    1,2,3        
  2    5,21,8
  3    2,4,15
  </code></pre></li>
  <li><p>table_categories</p>
  
  <pre><code>id   name   parent        
  1    Cat1   0      
  2    Cat2   0
  3    Cat3   0
  4    Cat4   0  
  </code></pre></li>
  </ol>
  
  <p>This is my request:</p>
  
  <pre><code>SELECT `id`, `name`, `parent`
  FROM `table_categories`
  ORDER BY `parent` ASC, `id` ASC;
  </code></pre>
  
  <p>How can I perform the request above and also get the number of products in each category (from table_products).
  May be using (FIND_IN_SET).</p>