From: Tom Lane <tgl@sss.pgh.pa.us>
To: Oliver Duke-Williams <o.duke-williams@geog.leeds.ac.uk>
Cc: pgsql-sql@postgresql.org
Subject: Re: Can a table have a reference to itself?
Date: Mon, 28 Jul 2003 01:31:29 -0400
Message-ID: <27090.1059370289@sss.pgh.pa.us> (raw)
In-Reply-To: <3F1E9F6E.2090600@geog.leeds.ac.uk>
References: <3F1E9F6E.2090600@geog.leeds.ac.uk>
Oliver Duke-Williams <o.duke-williams@geog.leeds.ac.uk> writes:
> So far so good, but what I'd like to do is to be able to change a value
> of a, and have this cascaded to b; however this gives an integrity
> violation error:
>> update foo set a = 5 where a = 2;
> ERROR: chk_a referential integrity violation - key referenced from foo
> not found in foo
Seems to work in 7.3.4 and CVS tip:
regression=# update foo set a = 5 where a = 2;
UPDATE 1
regression=# select * from foo;
a | b
---+---
1 | 1
3 | 5
5 | 5
(3 rows)
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, o.duke-williams@geog.leeds.ac.uk
Subject: Re: Can a table have a reference to itself?
In-Reply-To: <27090.1059370289@sss.pgh.pa.us>
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