code: def sorted(field_name, ascending=True, fields=None, count=5):
      if field_name is None:
        raise Exception('Sort field must be specified')
      direction = '' if ascending else ' DESC'
      projection = Sampling._create_projection(fields)
      return lambda sql: 'SELECT %s FROM (%s) ORDER BY %s%s LIMIT %d' % (projection, sql, field_name,
                                                                         direction, count)