Loading docs/topics/db/aggregation.txt +11 −0 Original line number Diff line number Diff line Loading @@ -184,6 +184,17 @@ of the ``annotate()`` clause is a ``QuerySet``; this ``QuerySet`` can be modified using any other ``QuerySet`` operation, including ``filter()``, ``order_by()``, or even additional calls to ``annotate()``. .. admonition:: If in doubt, inspect the SQL query! In order to understand what happens in your query, consider inspecting the ``query`` property of your ``QuerySet``. For instance, combining multiple aggregations with ``annotate()`` will yield the wrong results, as `multiple tables are the cross joined`_, resulting in duplicate row aggregations. .. _multiple tables are the cross joined: https://code.djangoproject.com/ticket/10060 Joins and aggregates ==================== Loading Loading
docs/topics/db/aggregation.txt +11 −0 Original line number Diff line number Diff line Loading @@ -184,6 +184,17 @@ of the ``annotate()`` clause is a ``QuerySet``; this ``QuerySet`` can be modified using any other ``QuerySet`` operation, including ``filter()``, ``order_by()``, or even additional calls to ``annotate()``. .. admonition:: If in doubt, inspect the SQL query! In order to understand what happens in your query, consider inspecting the ``query`` property of your ``QuerySet``. For instance, combining multiple aggregations with ``annotate()`` will yield the wrong results, as `multiple tables are the cross joined`_, resulting in duplicate row aggregations. .. _multiple tables are the cross joined: https://code.djangoproject.com/ticket/10060 Joins and aggregates ==================== Loading
