如何在django中连接表

from django.db import models

class User(models.Model):
    username = models.CharField(max_length=100)
    # 其他字段...

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    # 其他字段...

from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)
    # 其他字段...

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)
    # 其他字段...

from django.db import models

class Student(models.Model):
    name = models.CharField(max_length=100)
    courses = models.ManyToManyField(Course)
    # 其他字段...

class Course(models.Model):
    name = models.CharField(max_length=100)
    # 其他字段...