"Donald Fraser" <postgres@xxxxxxxxxxxxxxx> writes: > From: "Tom Lane" >> keeping the currently assigned OID in the aux table, setting the >> field to null or zero if the user doesn't currently exist in pg_authid. > Our "user" table stores information about the user before, during and > after the user is a postgresql user so that we can effectively hold an > audit of who has created, edited, deleted what and when. Therefore > the primary key (SYSID) in this table, is the foreign key in many > other tables that users can access for record creation and > modification. Therefore the primary key cannot be null when the > user is no longer a postgresql user and idealy we don't want it > changing as this could potentially mean 100's if not 1000's of > foreign key cascading updates. I didn't say it should be the primary key. You can still use a notional sysid as your pkey, you just need an additional column that records the current OID (if any) of the user as a PG user. This is essentially the reverse of your proposal to add an unused sysid column to pg_authid ... regards, tom lane
