Fixed -- Added imports to examples in "Expressions can reference transforms" section.
@@ -701,15 +701,18 @@ Django supports using transforms in expressions.
For example, to find all ``Entry`` objects published in the same year as they
were last modified::
+ >>> from django.db.models import F
>>> Entry.objects.filter(pub_date__year=F('mod_date__year'))
To find the earliest year an entry was published, we can issue the query::
+ >>> from django.db.models import Min
>>> Entry.objects.aggregate(first_published_year=Min('pub_date__year'))
This example finds the value of the highest rated entry and the total number
of comments on all entries for each year::
+ >>> from django.db.models import OuterRef, Subquery, Sum
>>> Entry.objects.values('pub_date__year').annotate(
... top_rating=Subquery(
... Entry.objects.filter(
