Foreign keys, table inheritance, and TRUNCATE

[Florian Weimer <fweimer@xxxxxx>]

Here's something I've just noticed:

CREATE TABLE foo (f INTEGER PRIMARY KEY);
INSERT INTO foo VALUES (1);
CREATE TABLE bar (b INTEGER REFERENCES foo);
CREATE TABLE bar1 () INHERITS (bar);
INSERT INTO bar1 VALUES (1);

This is quite correct:

TRUNCATE foo;
ERROR:  cannot truncate a table referenced in a foreign key constraint
DETAIL:  Table "bar" references "foo".
HINT:  Truncate table "bar" at the same time, or use TRUNCATE ... CASCADE.

But:

TRUNCATE foo, bar;
SELECT * FROM bar;
 b
---
 1
(1 row)

SELECT * FROM foo;
 f
---
(0 rows)

Whoops.  The referential constraint has been violated.  Perhaps it's a
good idea to extend TRUNCATE on a parent table to all children?

-- 
Florian Weimer                <fweimer@xxxxxx>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
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