code: def pg_version(using=None):
      
      connection = get_connection(using)
      cursor = connection.cursor()
  
      cursor.execute('SHOW server_version')
      row = cursor.fetchone()
  
      return tuple([int(i) for i in row[0].split('.')])
docs: Return tuple with PostgreSQL version of a specific connection
      :type using: str
      :param using: Connection name
      :rtype: tuple
      :return: PostgreSQL version