Sql 如何使用Django管理外部联接、分组和计数

使用Django，我有以下模型：

class Player(models.Model):
    name = models.CharField(max_length=64)
    description = models.CharField(max_length=128)
    groupPlayer = models.ForeignKey(GroupPlayer)


class GroupPlayer(models.Model):
    description = models.CharField(max_length=128)
    name = models.CharField(max_length=32)

每个玩家都链接到一个组。有些团体没有球员。我的目标是在Django中翻译以下查询（包括左外部联接和GROUPBY）：

到目前为止，我已经创建了3个queryset，但我无法将它们放在一起以获得我希望的结果：

   queryset_player = Player.objects.values('groupPlayer_id').annotate(total=Count('groupPlayer__id'))
   queryset_group = GroupPlayer.objects.select_retated(queryset_player)
   queryset_group2 = GroupPlayer.objects.all().prefetch_related('player_set')

任何人都可以帮助左外连接、分组和计数

谢谢

   queryset_player = Player.objects.values('groupPlayer_id').annotate(total=Count('groupPlayer__id'))
   queryset_group = GroupPlayer.objects.select_retated(queryset_player)
   queryset_group2 = GroupPlayer.objects.all().prefetch_related('player_set')

from django.db.models import Count

groups = GroupPlayer.objects.annotate(num_players=Count('player'))
groups[0].num_players