DextractYear和DextractMonth在Django中返回无

我试图根据年、月和列值对数据进行分组。 问题是

 FeedbackData.objects.annotate(year=ExtractYear('created'), month=ExtractMonth('created')).values('year','month','start_operator_alias').annotate(dcount=Count('*')).values('year', 'month','start_operator_alias','dcount')

我得到的结果是：

<QuerySet [{'year': None, 'start_operator_alias': 7, 'dcount': 12858, 'month': None}, {'year': None, 'start_operator_alias': 2, 'dcount': 185042, 'month': None}, {'year': None, 'start_operator_alias': 5, 'dcount': 13963, 'month': None}, {'year': None, 'start_operator_alias': 3, 'dcount': 127819, 'month': None}, {'year': None, 'start_operator_alias': 0, 'dcount': 566040, 'month': None}, {'year': None, 'start_operator_alias': 6, 'dcount': 83877, 'month': None}, {'year': None, 'start_operator_alias': 1, 'dcount': 170064, 'month': None}, {'year': None, 'start_operator_alias': -1, 'dcount': 36550, 'month': None}, {'year': None, 'start_operator_alias': 4, 'dcount': 25714, 'month': None}, {'year': None, 'start_operator_alias': 8, 'dcount': 200, 'month': None}]>

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如果没有任何时区信息加载到mysql中，就会发生这种情况

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反馈数据.objects.annotation（year=ExtractYear（'created'）、month=ExtractMonth（'created'））。值（'year'、'month'、'start\u operator\u alias'）返回什么？@AntonShurashov返回。。。基本上我是在尝试按年、月对数据进行分组，然后找到计数是的，我理解，这是一种奇怪的行为。尝试在不使用

.annotate（dcount=Count（'*'）

的情况下运行查询，以了解

Count

函数或创建的

字段中的问题。如果没有
Count
的查询也包含空的年和月，请检查
创建的
字段中的数据，可能是空的，或者数据库中的类型不正确。@下面的AntonShurashov查询处理了精细的反馈数据。objects.extra（{“年”：“提取（从创建的年）”，“月”：“提取（从已创建的月份）”}。值（'year'、'month'、'start\u operator\u alias'）。注释（dcount=Count（'*'）。值（'year'、'month'、'start\u operator\u alias'、'dcount'）。排序依据（）
model:
class FeedbackData(models.Model):
  deviceId = models.CharField(blank=True, null=True, max_length=64, db_tablespace="indexes")
  start_cellId = models.CharField(null=True, blank=True, max_length=32)
  end_cellId = models.CharField(null=True, blank=True, max_length=32)
  start_mcc = models.CharField(null=True, blank=True, max_length=32)
  end_mcc = models.CharField(null=True, blank=True, max_length=32)
  start_mnc = models.CharField(null=True, blank=True, max_length=32)
  end_mnc = models.CharField(null=True, blank=True, max_length=32)
  start_lac = models.CharField(null=True, blank=True, max_length=32)
  end_lac = models.CharField(null=True, blank=True, max_length=32)
  start_operator_name = models.CharField(db_index=True, null=True, max_length=32, blank=True)
  start_operator_alias = models.IntegerField(db_index=True, null=True, default=-1)
  end_operator_name = models.CharField(db_index=True, null=True, max_length=32, blank=True)
  end_operator_alias = models.IntegerField(db_index=True, null=True, default=-1)
  start_signal_strength = models.CharField(null=True, blank=True, max_length=32)
  end_signal_strength = models.CharField(null=True, blank=True, max_length=32)
  average_signal_strength = models.CharField(null=True, blank=True, max_length=32)
  phone_type = models.CharField(db_index=True, null=True, blank=True, max_length=8, default='unknown')
  call_duration = models.IntegerField(db_index=True, null=True, blank=True, default=0)
  network_type = models.CharField(db_index=True, null=True, blank=True, max_length=16, default='unknown')
  start_cell_signal_strength = models.CharField(null=True, blank=True, max_length=32)
  end_cell_signal_strength = models.CharField(null=True, blank=True, max_length=32)
  device_model = models.CharField(null=True, blank=True, max_length=64)
  device_manufacturer = models.CharField(db_index=True, null=True, blank=True, max_length=64)
  os_version = models.CharField(db_index=True, null=True, blank=True, max_length=32)
  start_time_of_call = models.DateTimeField(blank=True, null=True)
  end_time_of_call = models.DateTimeField(blank=True, null=True)
  start_lon = models.FloatField(db_index=True, null=True, blank=True)
  start_lat = models.FloatField(db_index=True, null=True, blank=True)
  end_lon = models.FloatField(db_index=True, null=True, blank=True)
  end_lat = models.FloatField(db_index=True, null=True, blank=True)
  start_lon_rad = models.FloatField(db_index=True, null=True, blank=True) 
  start_lat_rad = models.FloatField(db_index=True, null=True, blank=True)
  end_lon_rad = models.FloatField(db_index=True, null=True, blank=True)
  end_lat_rad = models.FloatField(db_index=True, null=True, blank=True)
  start_cdma_lon = models.FloatField(db_index=True, null=True, blank=True)
  start_cdma_lat = models.FloatField(db_index=True, null=True, blank=True)
  end_cdma_lon = models.FloatField(db_index=True, null=True, blank=True)
  end_cdma_lat = models.FloatField(db_index=True, null=True, blank=True)
  rating_time = models.DateTimeField(blank=True, null=True)
  speed = models.FloatField(null=True, blank=True)
  altitude = models.FloatField(null=True, blank=True)
  is_dual = models.BooleanField(db_index=True, default=False)
  is_roaming = models.BooleanField(db_index=True, default=False)
  is_network_roaming = models.BooleanField(default=False)
  call_drop = models.IntegerField(db_index=True, null=True)
  rating = models.FloatField(db_index=True, null=True, blank=True)
  state_name = models.CharField(db_index=True, null=True, blank=True, max_length=255)
  additional_info = models.CharField(db_index=True, null=True, blank=True, max_length=216)
  comment = models.CharField(null=True, blank=True, max_length=512)
  in_out = models.IntegerField(db_index=True, null=True)
  created = models.DateTimeField(db_index=True, auto_now_add=True)