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fix cross join test and add docs #776

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fix cross join test and add docs #776

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16 changes: 16 additions & 0 deletions README.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -478,6 +478,22 @@ Example of a join using `USING`

SELECT "history".* FROM "history" JOIN "customers" USING "customer_id" WHERE "customers"."id"=5

Example of a cross join
~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: python

history, customers = Tables('history', 'meta')
q = Query \
.from_(history) \
.cross_join(meta) \
.cross() \
.select(history.star)

.. code-block:: sql

SELECT "history".* FROM "history" CROSS JOIN "meta"


Example of a correlated subquery in the `SELECT`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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11 changes: 3 additions & 8 deletions pypika/tests/test_joins.py
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Expand Up @@ -111,20 +111,15 @@ def test_outer_join(self):
self.assertEqual(expected, str(query))

def test_cross_join(self):
expected = 'SELECT * FROM "abc" CROSS JOIN "efg" ON "abc"."foo"="efg"."bar"'
expected = 'SELECT * FROM "abc" CROSS JOIN "efg"'

with self.subTest("join with enum"):
query = (
Query.from_(self.table0)
.join(self.table1, how=JoinType.cross)
.on(self.table0.foo == self.table1.bar)
.select("*")
)
query = Query.from_(self.table0).join(self.table1, how=JoinType.cross).cross().select("*")

self.assertEqual(expected, str(query))

with self.subTest("join function"):
query = Query.from_(self.table0).cross_join(self.table1).on(self.table0.foo == self.table1.bar).select("*")
query = Query.from_(self.table0).cross_join(self.table1).cross().select("*")
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@williambdean williambdean Jan 18, 2024

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This might be an API design item, but why does cross and cross_join have to be called?
Does cross take arguments?

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@kdelinx kdelinx Jan 12, 2025

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This method must be called for return self of Query instance and able to continue make Build query

self.assertEqual(expected, str(query))

def test_left_outer_join(self):
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