From: Michael Fuhr <mike@fuhr.org>
To: Kenneth Gonsalves <lawgon@thenilgiris.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: unique constraints
Date: Wed, 7 Jan 2004 10:31:47 -0700
Message-ID: <20040107103147.A11576@quality.qadas.com> (raw)
In-Reply-To: <0401071947320T.02497@thenilgiris.com>
References: <0401071947320T.02497@thenilgiris.com>
On Wed, Jan 07, 2004 at 07:47:32PM +0530, Kenneth Gonsalves wrote:
> in 7.4 i'm getting an error message - UNIQUE constraint matching keys for
> table 'xxx' not found - any clues?
It would be helpful to see the *exact* wording of the error message and
the SQL statements that can be used to reproduce the error.
I'd guess that you tried to create a foreign key constraint whose
referenced column(s) didn't have a UNIQUE constraint:
=> CREATE TABLE foo (foo_id INTEGER NOT NULL);
CREATE TABLE
=> CREATE TABLE bar (foo_id INTEGER NOT NULL REFERENCES foo (foo_id));
ERROR: there is no unique constraint matching given keys for referenced table "foo"
The referenced column(s) should either be a PRIMARY KEY or have a UNIQUE
constraint:
=> CREATE TABLE foo (foo_id INTEGER PRIMARY KEY);
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "foo_pkey" for table "foo"
CREATE TABLE
=> CREATE TABLE bar (foo_id INTEGER NOT NULL REFERENCES foo (foo_id));
CREATE TABLE
See the "Foreign Keys" documentation for more info:
http://www.postgresql.org/docs/current/static/ddl-constraints.html#DDL-CONSTRAINTS-FK
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
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To: pgsql-sql@postgresql.org
Cc: mike@fuhr.org, lawgon@thenilgiris.com
Subject: Re: unique constraints
In-Reply-To: <20040107103147.A11576@quality.qadas.com>
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