code: def get_subdomains_count(self, accepted=True, cur=None):
          
          if accepted:
              accepted_filter = 'WHERE accepted=1'
          else:
              accepted_filter = ''
  
          get_cmd = "SELECT COUNT(DISTINCT fully_qualified_subdomain) as count FROM {} {};".format(
              self.subdomain_table, accepted_filter)
  
          cursor = cur
          if cursor is None:
              cursor = self.conn.cursor()
  
          db_query_execute(cursor, get_cmd, ())
  
          try:
              rowdata = cursor.fetchone()
              return rowdata['count']
          except Exception as e:
              if BLOCKSTACK_DEBUG:
                  log.exception(e)
              return 0
docs: Fetch subdomain names