The left outer join () takes all tuples in the left relation that will not fit with any specific tuple in the right relation, pads the tuples with null values for all other attributes from the right relation, and also adds them to the result of the natural join

The right outer join () is symmetric with the left outer join: It pads tuples from the right relation that would not match any from the left relation with nulls and adds them to the result of the natural join.