Fixed -- Used a simpler example in the aggregation "cheat sheet" docs.
@@ -67,11 +67,11 @@ In a hurry? Here's how to do common aggregate queries, assuming the models above
>>> Book.objects.all().aggregate(Max('price'))
{'price__max': Decimal('81.20')}
- # Cost per page
- >>> from django.db.models import F, FloatField, Sum
- >>> Book.objects.all().aggregate(
- ... price_per_page=Sum(F('price')/F('pages'), output_field=FloatField()))
- {'price_per_page': 0.4470664529184653}
+ # Difference between the highest priced book and the average price of all books.
+ >>> from django.db.models import FloatField
+ >>> Book.objects.aggregate(
+ ... price_diff=Max('price', output_field=FloatField()) - Avg('price')))
+ {'price_diff': 46.85}
# All the following queries involve traversing the Book<->Publisher
# foreign key relationship backwards.
