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DOCS-7624: Add Note about _id in SQL vs Mongo #2599

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DOCS-7624: Add Note about _id in SQL vs Mongo #2599

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8 changes: 8 additions & 0 deletions source/reference/sql-comparison.txt
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Expand Up @@ -85,6 +85,14 @@ Select
The following table presents the various SQL statements related to
reading records from tables and the corresponding MongoDB statements.

.. note::

The :method:`~db.collection.find()` method always includes the ``_id``
field in the returned documents unless specifically excluded through
:ref:`projection<projection>`. Some of the SQL queries below may include an
``_id`` field to reflect this, even if the field is not included in the
corresponding :method:`~db.collection.find()` query.

.. include:: /includes/table/sql-to-mongo-select-examples.rst

For more information, see
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