title: Create View that separates a line in various
body: <p>I have this table:</p>
  
  <pre><code>-- Product --
  id_product
  date-begin
  date_end
  period
  </code></pre>
  
  <p>And fill with:</p>
  
  <pre><code>id_project | date_begin | date_end | period
  1 | 2015-01-01 | 2016-01-01 | 1 month
  2 | 2015-12-01 | 2015-12-29 | 1 week
  </code></pre>
  
  <p>I wanted the View to show it:</p>
  
  <pre><code>id_project | date_payment
  1 | 2015-02-01
  1 | 2015-03-01
  1 | 2015-04-01
  ...
  1 | 2016-01-01
  2 | 2015-12-01
  2 | 2015-12-08
  2 | 2015-12-15
  2 | 2015-12-22
  2 | 2015-12-29
  </code></pre>
  
  <p>How do I divide a line into several?</p>