I found some surprising behavior with the new EXCLUDE constraint in 9.0.0- it seems that EXCLUDE constraint names have to be unique across tables: test=# BEGIN; BEGIN test=# CREATE TABLE a(a INTEGER); CREATE TABLE test=# CREATE TABLE b(b INTEGER); CREATE TABLE test=# ALTER TABLE a ADD CONSTRAINT testo1 CHECK(a=1); ALTER TABLE test=# ALTER TABLE b ADD CONSTRAINT testo1 CHECK(b=1); ALTER TABLE test=# ALTER TABLE a ADD CONSTRAINT testo2 EXCLUDE (a WITH =); NOTICE: ALTER TABLE / ADD EXCLUDE will create implicit index "testo2" for table "a" ALTER TABLE test=# ALTER TABLE b ADD CONSTRAINT testo2 EXCLUDE (b WITH =); NOTICE: ALTER TABLE / ADD EXCLUDE will create implicit index "testo2" for table "b" ERROR: relation "testo2" already exists test=# Also, the error message is odd and could be improved. The workaround is to use unique constraint names, but I would like to better understand why they need to be unique in the first place when other constraint names need not be. Cheers, M -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
