title: Merge two MySQL tables
body: <p>I have two tables: data and comments</p>
  
  <pre><code>data:
  -------------------
  id | name | email |
  
  pics:
  -------------------
  msg_id | pic |
  </code></pre>
  
  <p>The data is assosiated by id and msg_id. How I can merge this two tables into final one? </p>
  
  <p>Edit: some rows in data don't have associated a pic, and i need to keep them.</p>