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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/topics/db/queries.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/topics/db/queries.txt b/docs/topics/db/queries.txt index d256545453..6deeec5037 100644 --- a/docs/topics/db/queries.txt +++ b/docs/topics/db/queries.txt @@ -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( |