Apparently, you can write this (an attempt at a convenient workaround for lack of functional dependency tracking pre-9.1):
SELECT pg_class.* FROM pg_class GROUP BY pg_class.*; It won't work: ERROR: 42803: column "pg_class.relname" must appear in the GROUP BY clause or be used in an aggregate function But the whole thing is a bit confusing. This works (of course): SELECT pg_class FROM pg_class GROUP BY pg_class; And this behaves equivalently, apparently: SELECT pg_class FROM pg_class GROUP BY pg_class.*; Is there any rhyme or reason for this? I couldn't find anything about this in the documentation or in the SQL standard. I guess the whole thing is inconsistent all over the place; I'd just like to verify that the current behavior is somewhat intentional. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
