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Fixed #10035 -- Corrected more typos in the aggregation docs. Thanks to Ivan Sagalaev for his eagle eyes. 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9753 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Russell Keith-Magee 2009-01-15 22:33:55 +00:00
parent d55b361ac4
commit bf710bd005
1 changed files with 3 additions and 3 deletions
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docs/topics/db/aggregation.txt
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@ -268,14 +268,14 @@ the annotation is computed over all members of the group.
For example, consider an author query that attempts to find out the average For example, consider an author query that attempts to find out the average
rating of books written by each author: rating of books written by each author:
>>> Author.objects.annotate(average_rating=Avg('book_rating')) >>> Author.objects.annotate(average_rating=Avg('book__rating'))
This will return one result for each author in the database, annotate with This will return one result for each author in the database, annotate with
their average book rating. their average book rating.
However, the result will be slightly different if you use a ``values()`` clause:: However, the result will be slightly different if you use a ``values()`` clause::
>>> Author.objects.values('name').annotate(average_rating=Avg('book_rating')) >>> Author.objects.values('name').annotate(average_rating=Avg('book__rating'))
In this example, the authors will be grouped by name, so you will only get In this example, the authors will be grouped by name, so you will only get
an annotated result for each *unique* author name. This means if you have an annotated result for each *unique* author name. This means if you have
@ -302,7 +302,7 @@ output.
For example, if we reverse the order of the ``values()`` and ``annotate()`` For example, if we reverse the order of the ``values()`` and ``annotate()``
clause from our previous example:: clause from our previous example::
>>> Author.objects.annotate(average_rating=Avg('book_rating')).values('name') >>> Author.objects.annotate(average_rating=Avg('book__rating')).values('name')
This will now yield one unique result for each author; however, only This will now yield one unique result for each author; however, only
the author's name and the ``average_rating`` annotation will be returned the author's name and the ``average_rating`` annotation will be returned