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Mike Bayer 654b462d66 tutorial 2.0 WIP

Add SelectBase.exists() method as it seems strange this is
not available already.  The Exists construct itself does
not provide full SELECT-building capabilities so it makes
sense this should be used more like a scalar_subquery.

Make sure stream_results is getting set up when yield_per
is used, for 2.0 style statements as well.  this was
hardcoded inside of Query.yield_per() and is now moved
to take place within QueryContext.

Change-Id: Icafcd4fd9b708772343d56edf40995c9e8f835d6

2020-10-31 13:44:53 -04:00

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 .. note *_include.rst is a naming convention in conf.py
 .. |tutorial_title| replace:: SQLAlchemy 1.4 / 2.0 Tutorial
 .. topic:: |tutorial_title|
       This page is part of the :doc:`index`.
       Previous: |prev|   |   Next: |next|
 .. footer_topic:: |tutorial_title|
       Next Tutorial Section: |next|