The following bug has been logged online:
Bug reference: 6048
Logged by: Artiom Makarov
Email address: artiom.makarov@gmail.com
PostgreSQL version: 9.04
Operating system: 2.6.32-30-server #59-Ubuntu SMP Tue Mar 1 22:46:09 UTC
2011 x86_64 GNU/Linux
Description: TRUNCATE vs TRUNCATE CASCADE: misleading message
Details:
create table tr_test1(id1 int, primary key(id1));
create table tr_test2(id2 int, id int, primary key(id2), foreign key (id)
references tr_test1(id1) MATCH SIMPLE ON UPDATE RESTRICT ON DELETE
RESTRICT);
create table tr_test3(id3 int, id int, primary key(id3), foreign key (id)
references tr_test2(id2) MATCH SIMPLE ON UPDATE RESTRICT ON DELETE
RESTRICT);
insert into tr_test1(id1) values (1);
insert into tr_test2(id2,id) values (1,1);
insert into tr_test2(id2,id) values (2,1);
insert into tr_test3(id3,id) values (1,2);
truncate tr_test1;
ERROR: cannot truncate a table referenced in a foreign key constraint
SQL state: 0A000
Detail: Table "tr_test2" references "tr_test1".
Hint: Truncate table "tr_test2" at the same time, or use TRUNCATE ...
CASCADE.
This is definetly misleading message, because of when applying truncate
tr_test1 CASCADE; all 3 tables truncated:
NOTICE: truncate cascades to table "tr_test2"
NOTICE: truncate cascades to table "tr_test3"
While drop schema public; command list all affected objects:
ERROR: cannot drop schema public because other objects depend on it
SQL state: 2BP01
Detail: table tr_test1 depends on schema public
table tr_test2 depends on schema public
table tr_test3 depends on schema public
Hint: Use DROP ... CASCADE to drop the dependent objects too.
