From: Markus Bertheau <twanger@bluetwanger.de>
To: pgsql-sql@postgresql.org
Subject: time of constraint checking
Date: Wed, 20 Oct 2004 17:58:12 +0200
Message-ID: <1098287892.2649.15.camel@dicaprio.akademie1.de> (raw)
Hi,
http://www.postgresql.org/docs/current/static/sql-createtable.html says,
down at the explanation of DEFERRABLE, that constraints are checked
after every command. Why does the following not work then:
CREATE TABLE foo (
pos INT UNIQUE
);
INSERT INTO foo (pos) VALUES (1);
INSERT INTO foo (pos) VALUES (2);
UPDATE foo SET pos = CASE WHEN pos = 2 THEN 1 ELSE 2 END;
ERROR: duplicate key violates unique constraint "foo_pos_key"
Also, are deferrable constraints other that FK constraints in the works?
I also noticed, that the docs don't state whether INITIALLY IMMEDIATE or
INITIALLY DEFERRED is the default.
Thanks.
--
Markus Bertheau <twanger@bluetwanger.de>
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To: pgsql-sql@postgresql.org
Cc: twanger@bluetwanger.de
Subject: Re: time of constraint checking
In-Reply-To: <1098287892.2649.15.camel@dicaprio.akademie1.de>
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