Question about documentauion under Managers>Adding extra Manager methods

In the example:

class PollManager(models.Manager):      def with_counts(self):          from django.db import connection          cursor = connection.cursor()          cursor.execute("""              SELECT p.id, p.question, p.poll_date, COUNT(*)              FROM polls_opinionpoll p, polls_response r              WHERE p.id = r.poll_id              GROUP BY 1, 2, 3              ORDER BY 3 DESC""")          result_list = []          for row in cursor.fetchall():              p = self.model(id=row[0], question=row[1], poll_date=row[2])              p.num_responses = row[3]              result_list.append(p)          return result_list    class OpinionPoll(models.Model):      question = models.CharField(max_length=200)      poll_date = models.DateField()      objects = PollManager()    class Response(models.Model):      poll = models.ForeignKey(OpinionPoll)      person_name = models.CharField(max_length=50)      response = models.TextField()

What is the sql dialect that is used.

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