>>>>> "André" == André Hänsel <andre@webkr.de> writes:
André> Case 2:
André> CREATE TABLE t(c integer);
André> ALTER TABLE t ADD CONSTRAINT foo CHECK(c > 1);
André> ALTER TABLE t ADD CONSTRAINT foo UNIQUE(c);
André> -> Creates two constraints, both called "foo".
I'd call _that_ a bug, myself - having two constraints on a table with
the same name potentially messes up a lot of automated maintenance
operations.
André> In cases where two constraints with the same name are created,
André> an "ALTER TABLE t DROP CONSTRAINT ..." drops the UNIQUE first.
André> Issuing the ALTER TABLE a second time then drops the CHECK.
I think that's purely an artifact of what order an index scan on
pg_constraint_conrelid_index finds the constraints.
--
Andrew (irc:RhodiumToad)