I have a db in which users can view and update data only via views.
It is my understanding that the privileges of the view/rule creator do not
extend to sequences. Therefore, I have to give users permissions to
sequences, just to the extent that they could add records. What is the
minimum set of privileges for this? Are SELECT privileges on sequences
enough? What happens actually when a user issues a statement: SELECT
nextval("sequence")? What about setval()? Do these involve only a SELECT to
the sequence, or is it an UPDATE, or is it a DELETE and INSERT, or just an
INSERT?