title: how to select only some columns in SQLAlchemy?
body: <p><strong>This is my python code:</strong></p>
  
  <pre><code> cx=sqlalchemy.create_engine(u"mysql://username:password@ipaddress/database?charset=utf8")
  
   metadata=sqlalchemy.MetaData(cx)
   orm_obj=sqlalchemy.Table(u'I_POI',metadata,autoload=True)
  
  
   sql=orm_obj.select(u'poi_id,poi_name').where(u'poi_id&gt;1 and poi_id&gt;0').limit(3).offset(0)
  
   resultz=sql.execute()
   for i in resultz:
       print i
  </code></pre>
  
  <hr>
  
  <p>[DB] I_POI Table:poi_id,poi_name,poi_data1,poi_data2......poi_data10<br></p>
  
  <p>I do it with existing database,but "select()" is no work..It still return total columns.<br>
  I want to get only some columns,please help me.</p>