title: SQL query error unknown column in SELECT + JOIN +
body: <p>This is my SQL code (using phpmyadmin simulator) :</p>
  
  <pre><code>SELECT user_activity.user_ip,user_activity.id,user_activity.post_id , posts.id
  FROM  user_activity,users 
  INNER JOIN posts ON user_activity.post_id = posts.id
  WHERE user_activity.user_id = users.id and users.forgen_note = 'test note'; 
  </code></pre>
  
  <p>And it respons an error:</p>
  
  <pre><code>MySQL said: Documentation
  
  #1054 - Unknown column 'user_activity_now.stream_id' in 'on clause'
  </code></pre>
  
  <p>How can I fix it please?</p>