Django의 N+1 문제, Eager Loading, prefetch_related, select_related 등

기본적인 모델 구조 예시 from django.db import models class Customer(models.Model): user = models.OneToOneField(User, null=True, blank=True, on_delete=models.CASCADE) phone = models.CharField(max_length=20, null=True) address = models.CharField(max_length=100, null=True) city = models.CharField(max_length=50, null=True) state = models.CharField(max_length=50, null=True) zipcode = models.CharField(max_lengt..