PG Doc comments form <noreply@postgresql.org> writes:
> "If you declare a column as UNIQUE or PRIMARY KEY, the implicitly generated
> index is case-sensitive. So it's useless for case-insensitive searches, and
> it won't enforce uniqueness case-insensitively."
> I think the statement above is not correct. I tried creating a PK or unique
> key index on a CITEXT column. It checks uniqueness in case-insensitivity.
That paragraph is talking about what happens when you *don't* use citext.
regards, tom lane