From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Chris Fischer <Chris(dot)Fischer(at)channeladvisor(dot)com>, pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: Problem identifying constraints which should not be inherited |
Date: | 2008-03-07 01:07:07 |
Message-ID: | 200803070107.m27177O15696@momjian.us |
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Lists: | pgsql-bugs pgsql-hackers |
Added to TODO:
> o Require all CHECK constraints to be inherited
>
> http://archives.postgresql.org/pgsql-bugs/2007-04/msg00026.php
---------------------------------------------------------------------------
Tom Lane wrote:
> "Chris Fischer" <Chris(dot)Fischer(at)channeladvisor(dot)com> writes:
> > alter table only t1 add constraint ck_col1 check (number <> 0);
>
> The bug here is that we allow that. Continuing your example,
>
> regression=# insert into t2 values(0);
> INSERT 0 1
> regression=# select * from t1;
> col1
> ------
> 0
> (1 row)
>
> which sure looks to me like a violation of the principle of least
> surprise.
>
> This has come up before and I think the consensus was to disallow
> non-inherited check constraints; not sure why it hasn't been done yet.
>
> regards, tom lane
>
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--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://postgres.enterprisedb.com
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