should i use django's many-to-many option? -

django newb here, working off django polls tutorial , trying add model that'll keep track of poll results:

# create models here. class poll(models.model):     question = models.charfield(max_length=200)     pub_date = models.datetimefield('date published')     numchoices = models.integerfield(default=0)     def __unicode__(self):         return self.question  class choice(models.model):     poll = models.foreignkey(poll)     choice_text = models.charfield(max_length=200)     votes = models.integerfield(default=0)     def __unicode__(self):         return self.choice_text  class session_results(models.model):     sessionkey=models.foreignkey(session)     questionasked = models.foreignkey(poll)     answerchosen=models.foreignkey(choice)     def __unicode__(self):         return self.sessionkey 

the use case have list of questions (poll model), list of choices each choice maps question (choice model), , want keep list of sessions, can keep track of questions user has answered (session_results model). ultimately, i'd compare , stuff sessions. example if session x answered questions 1 , 2, find out other sessions answered questions 1 , 2, in mind involve self join in sql. if that's goal, should using many-to-many? thinking replacing line in session_results model:

questionasked = models.manytomanyfield(poll) 

after put line in , run python manage.py sql polls, see django automatically created join table me, table doesn't seem serving future needs. read https://docs.djangoproject.com/en/1.5/topics/db/examples/many_to_many/ page, , didn't seem answer question. given want do, using raw sql queries?

thanks!!