def get_key_columns(self, cursor, table_name):
        raise NotImplementedError
*musicpd.org, music database section:*
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/db/backends/__init__.py/BaseDatabaseIntrospection.get_key_columns--crossover with--dataset/ETHPy150Open mopidy/mopidy/mopidy/mpd/protocol/music_db.py/listfiles