diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/topics/db/queries.txt | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/docs/topics/db/queries.txt b/docs/topics/db/queries.txt index e14849bcc1..a9f1374687 100644 --- a/docs/topics/db/queries.txt +++ b/docs/topics/db/queries.txt @@ -139,8 +139,8 @@ To retrieve objects from your database, construct a :class:`~django.db.models.Manager` on your model class. A :class:`~django.db.models.query.QuerySet` represents a collection of objects -from your database. It can have zero, one or many *filters* -- criteria that -narrow down the collection based on given parameters. In SQL terms, a +from your database. It can have zero, one or many *filters*. Filters narrow +down the query results based on the given parameters. In SQL terms, a :class:`~django.db.models.query.QuerySet` equates to a ``SELECT`` statement, and a filter is a limiting clause such as ``WHERE`` or ``LIMIT``. @@ -256,10 +256,10 @@ Example:: These three ``QuerySets`` are separate. The first is a base :class:`~django.db.models.query.QuerySet` containing all entries that contain a headline starting with "What". The second is a subset of the first, with an -additional criteria that excludes records whose ``pub_date`` is greater than -now. The third is a subset of the first, with an additional criteria that -selects only the records whose ``pub_date`` is greater than now. The initial -:class:`~django.db.models.query.QuerySet` (``q1``) is unaffected by the +additional criteria that excludes records whose ``pub_date`` is today or in the +future. The third is a subset of the first, with an additional criteria that +selects only the records whose ``pub_date`` is today or in the future. The +initial :class:`~django.db.models.query.QuerySet` (``q1``) is unaffected by the refinement process. .. _querysets-are-lazy: @@ -1092,8 +1092,9 @@ the foreign key aren't saved to the database until you call >>> e.blog = some_blog >>> e.save() -If a :class:`~django.db.models.ForeignKey` field has ``null=True`` set (i.e., it allows ``NULL`` -values), you can assign ``None`` to it. Example:: +If a :class:`~django.db.models.ForeignKey` field has ``null=True`` set (i.e., +it allows ``NULL`` values), you can assign ``None`` to remove the relation. +Example:: >>> e = Entry.objects.get(id=2) >>> e.blog = None |