docs: def _count_ned_sources_in_database_requiring_metadata(
              self):
          """*Count the sources in the NED table requiring metadata*
  
          **Return:**
              - ``self.total``, ``self.batches`` -- total number of galaxies needing metadata & the number of batches required to be sent to NED
  
          *Usage:*
  
              .. code-block:: python
  
                  totalRemaining, numberOfBatches = stream._count_ned_sources_in_database_requiring_metadata()
          """
          self.log.debug(
              'starting the ``_count_ned_sources_in_database_requiring_metadata`` method')
  
          tableName = self.dbTableName
  
          sqlQuery = u"""
              select count(*) as count from %(tableName)s where raDeg is null and (download_error != 1 or download_error is null)
          """ % locals()
          rows = readquery(
              log=self.log,
              sqlQuery=sqlQuery,
              dbConn=self.cataloguesDbConn,
              quiet=False
          )
          self.total = rows[0]["count"]
          self.batches = int(self.total / 50000.) + 1
  
          if self.total == 0:
              self.batches = 0
  
          self.log.debug(
              'completed the ``_count_ned_sources_in_database_requiring_metadata`` method')
          return self.total, self.batches