title: What does nullColumnHack means?
body: <p>According to the SQLiteDatabase API documentation:</p>
  
  <ul>
  <li><p>insert(String table, String nullColumnHack, ContentValues values)</p>
  
  <p>Convenience method for inserting a row into the database.</p></li>
  </ul>
  
  <p>What does nullColumnHack means?</p>
  
  <p>Can you give me an example?</p>