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DOCSP-27736-sql-error (#5889) (#5937)
* DOCSP-27736-sql-error * DOCSP-27736-sql-error * DOCSP-27736-sql-error * DOCSP-27736-sql-error * DOCSP-27736-sql-error * DOCSP-27736-sql-error * DOCSP-27736-sql-error * DOCSP-27736-sql-error * DOCSP-27736-sql-error * DOCSP-27736-sql-error --------- Co-authored-by: jason-price-mongodb <[email protected]>
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source/reference/operator/aggregation/lookup.txt

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@@ -27,7 +27,7 @@ Definition
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the "joined" collection. The :pipeline:`$lookup` stage passes these
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reshaped documents to the next stage.
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Starting in MongoDB 5.1, :pipeline:`$lookup` works across sharded
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Starting in MongoDB 5.1, you can use :pipeline:`$lookup` with sharded
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collections.
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To combine elements from two different collections, use the
@@ -120,19 +120,25 @@ The :pipeline:`$lookup` takes a document with these fields:
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already exists in the input document, the existing field is
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*overwritten*.
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The operation would correspond to the following pseudo-SQL statement:
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The operation corresponds to this pseudo-SQL statement:
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.. code-block:: sql
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:copyable: false
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SELECT *, <output array field>
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FROM collection
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WHERE <output array field> IN (
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SELECT *
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SELECT *, (
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SELECT ARRAY_AGG(*)
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FROM <collection to join>
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WHERE <foreignField> = <collection.localField>
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);
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) AS <output array field>
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FROM collection;
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See these examples:
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.. note::
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The SQL statements on this page are included for comparison to the
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MongoDB aggregation pipeline syntax. The SQL statements aren't
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runnable.
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For MongoDB examples, see these pages:
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- :ref:`lookup-single-equality-example`
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- :ref:`unwind-example`
@@ -249,6 +255,7 @@ The :pipeline:`$lookup` stage accepts a document with these fields:
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The operation corresponds to this pseudo-SQL statement:
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.. code-block:: sql
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:copyable: false
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SELECT *, <output array field>
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FROM collection
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The operation corresponds to this pseudo-SQL statement:
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.. code-block:: sql
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:copyable: false
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SELECT *, <output array field>
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FROM localCollection
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The operation corresponds to this pseudo-SQL statement:
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.. code-block:: sql
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:copyable: false
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SELECT *, inventory_docs
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FROM orders
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The operation corresponds to this pseudo-SQL statement:
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.. code-block:: sql
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:copyable: false
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SELECT *, stockdata
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FROM orders
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The operation corresponds to this pseudo-SQL statement:
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.. code-block:: sql
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:copyable: false
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SELECT *, holidays
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FROM absences

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