Django视图聚合查询方法Avg(),Max(),Min(),Sum(),count()
"""4.聚合查询:Avg(),Max(),Min(),Sum(),count()"""
# from django.db.models import Avg, Max, Min, Sum
# print(Article.objects.count())
# print(Article.objects.filter(id__lt=13).count())
# print(Article.objects.aggregate(Avg('id')))
# print(Article.objects.aggregate(Max('id')))
# print(Article.objects.aggregate(Min('id')))
# print(Article.objects.filter(id__lt=13).aggregate(Sum('id')))