How to use NOT IN clause in sqlalchemy ORM query

Solution 1:

The ORM internals describe the not_in() operator (previously notin_()), so you can say:

query = query.filter(table_a.id.not_in(subquery))
#                               ^^^^^^

From the docs:

inherited from the ColumnOperators.not_in() method of ColumnOperators

implement the NOT IN operator.

This is equivalent to using negation with ColumnOperators.in_(), i.e. ~x.in_(y).

Note that version 1.4 states:

The not_in() operator is renamed from notin_() in previous releases. The previous name remains available for backwards compatibility.

So you may find notin_() in some cases.

Solution 2:

Try this:

subquery = session.query(table_c.id)
query = query.filter(~table_a.id.in_(subquery))

Note: table_a, table_b and table_c should be mapped classes, not Table instances.

Solution 3:

here is the full code:

#join table_a and table_b
query = session.query(table_a, table_b)
query = query.filter(table_a.id == table_b.id)

# create subquery
subquery = session.query(table_c.id)
# select all from table_a not in subquery
query = query.filter(~table_a.id.in_(subquery))