I suppose the below reference isn't intended to be done. But, I'd like to extend the pg_shadow table to store information about the database users and some of their actions (a history of changes). Is it safe to add a UNIQUE constraint to the usesysid or usename columns? temp=# \d pg_shadow Table "pg_shadow" Attribute | Type | Modifier -------------+---------+---------- usename | name | usesysid | integer | usecreatedb | boolean | usetrace | boolean | usesuper | boolean | usecatupd | boolean | passwd | text | valuntil | abstime | temp=# temp=# CREATE TABLE users ( temp(# pg_username name NOT NULL temp(# REFERENCES pg_shadow(usesysid) temp(# ON UPDATE CASCADE temp(# ON DELETE RESTRICT temp(# ); NOTICE: CREATE TABLE will create implicit trigger(s) for FOREIGN KEY check(s) ERROR: UNIQUE constraint matching given keys for referenced table "pg_shadow" not found temp=# -- Rod Taylor There are always four sides to every story: your side, their side, the truth, and what really happened.
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