Django:如何在两个数据库表中搜索，或者如何合并两个相关的类

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'database1',
        'USER': 'username1',
        'PASSWORD': 'password1',
        'HOST': 'localhost',
        'PORT': '3306',
    },
    'second_db': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'database2',
        'USER': 'username2',
        'PASSWORD': 'password2',
        'HOST': 'localhost',
        'PORT': '3306',
    }
}

class Table1(models.Model):
    # 模型字段定义

    class Meta:
        db_table = 'table1'
        using = 'default'


class Table2(models.Model):
    # 模型字段定义

    class Meta:
        db_table = 'table2'
        using = 'second_db'

result1 = Table1.objects.using('default').filter(field1='value')
result2 = Table2.objects.using('second_db').filter(field2='value')

from django.db.models import F

result = Table1.objects.using('default').filter(common_field=F('table2__common_field'))