title: Forgot to add Primary Keys
body: <p>I have duplicated (copied) a table and for some reason Primary Keys wasnt added.
  Now I have a lot of new records were added recently with 0 value in the <code>id</code> field. All the previous records does have a unique ID (from 1 to 302979).</p>
  
  <p>How to fix this?</p>
  
  <pre><code>#1062 - Duplicate entry '0' for key 'PRIMARY'
  </code></pre>
  
  <p><code>AUTO_INCREMENT</code> wasnt added as well.</p>
  
  <pre><code>CREATE TABLE `result` (
    `id` int(11) NOT NULL DEFAULT '0',
    `status` varchar(50) NOT NULL,
    `status_date` datetime NOT NULL,
    `member_id` int(11) NOT NULL
  ) ENGINE=MyISAM DEFAULT CHARSET=latin1
  </code></pre>