docs: def _update_sdss_coverage(
              self):
          """ update sdss coverage
  
          .. todo ::
  
              - update key arguments values and definitions with defaults
              - update return values and definitions
              - update usage examples and text
              - update docstring text
              - check sublime snippet exists
              - clip any useful text to docs mindmap
              - regenerate the docs and check redendering of this docstring
          """
          self.log.debug('starting the ``_update_sdss_coverage`` method')
  
          tableName = self.dbTableName
  
          # SELECT THE LOCATIONS NEEDING TO BE CHECKED
          sqlQuery = u"""
              select primary_ned_id, primaryID, raDeg, decDeg, sdss_coverage from %(tableName)s where sdss_coverage is null and master_row = 1 and in_ned = 1 order by dist_mpc;
          """ % locals()
          rows = readquery(
              log=self.log,
              sqlQuery=sqlQuery,
              dbConn=self.cataloguesDbConn,
              quiet=False
          )
  
          totalCount = len(rows)
          count = 0
          for row in rows:
              count += 1
              if count > 1:
                  # Cursor up three lines and clear
                  sys.stdout.write("\x1b[1A\x1b[2K")
                  sys.stdout.write("\x1b[1A\x1b[2K")
                  sys.stdout.write("\x1b[1A\x1b[2K")
  
              if count > totalCount:
                  count = totalCount
              percent = (float(count) / float(totalCount)) * 100.
  
              primaryID = row["primaryID"]
              raDeg = float(row["raDeg"])
              decDeg = float(row["decDeg"])
              primary_ned_id = row["primary_ned_id"]
  
              # SDSS CAN ONLY ACCEPT 60 QUERIES/MIN
              time.sleep(1.1)
              print "%(count)s / %(totalCount)s (%(percent)1.1f%%) NED galaxies checked for SDSS coverage" % locals()
              print "NED NAME: ", primary_ned_id
  
              # covered = True | False | 999 (i.e. not sure)
              sdss_coverage = check_coverage(
                  log=self.log,
                  ra=raDeg,
                  dec=decDeg
              ).get()
  
              if sdss_coverage == 999:
                  sdss_coverage_flag = "null"
              elif sdss_coverage == True:
                  sdss_coverage_flag = 1
              elif sdss_coverage == False:
                  sdss_coverage_flag = 0
              else:
                  self.log.error('cound not get sdss coverage' % locals())
                  sys.exit(0)
  
              # UPDATE THE DATABASE FLAG
              sqlQuery = u"""
                  update %(tableName)s set sdss_coverage = %(sdss_coverage_flag)s where primaryID = %(primaryID)s
              """ % locals()
              writequery(
                  log=self.log,
                  sqlQuery=sqlQuery,
                  dbConn=self.cataloguesDbConn,
              )
  
          self.log.debug('completed the ``_update_sdss_coverage`` method')
          return None