make a inner join to postgresql in django orm in python

To make an inner join to PostgreSQL in Django ORM you can use the select_related method on a queryset. This method allows you to follow foreign key relationships in your query and get related objects as part of the same query. Here's an example:

main.py
from myapp.models import MyModel

my_queryset = MyModel.objects.select_related('related_model').filter(...)
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This will execute an inner join to fetch the related related_model objects along with their respective MyModel object. The related_model is specified by the foreign key field name in your model.

You can also use prefetch_related method to achieve the same result:

main.py
from myapp.models import MyModel

my_queryset = MyModel.objects.prefetch_related('related_model').filter(...)
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This will execute a separate SQL query to fetch the related related_model objects after the initial query is executed. This method is useful when you need to retrieve many related objects and the join would be too slow.