From: Scott Marlowe <scott.marlowe@gmail.com>
To: Leif Biberg Kristensen <leif@solumslekt.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: DDL problems: Referential issue?
Date: Wed, 4 Nov 2009 13:03:26 -0700
Message-ID: <dcc563d10911041203r61124e04gf22e7f22a8bbd09@mail.gmail.com> (raw)
In-Reply-To: <200911041953.11714.leif@solumslekt.org>
References: <200911041903.36563.leif@solumslekt.org>
<200911041936.15292.leif@solumslekt.org>
<dcc563d10911041037p5fda84dv1c003c97c112cfc7@mail.gmail.com>
<200911041953.11714.leif@solumslekt.org>
On Wed, Nov 4, 2009 at 11:53 AM, Leif Biberg Kristensen
<leif@solumslekt.org> wrote:
> On Wednesday 4. November 2009 19.37.41 Scott Marlowe wrote:
>> On Wed, Nov 4, 2009 at 11:36 AM, Leif Biberg Kristensen
>> <leif@solumslekt.org> wrote:
>>> I'd missed that particular syntax.
>>>
>>> This table is now without a primary key, but is that a problem? I don't
>>> expect it to grow beyond maybe a few thousand rows.
>>
>> Hard to say, but if you really need a PK, you can always create one later.
>
> This looks strange to me, but it works:
>
> pgslekt=> CREATE TABLE participant_notes (
> pgslekt(> person_fk INTEGER NOT NULL,
> pgslekt(> event_fk INTEGER NOT NULL,
> pgslekt(> part_note TEXT,
> pgslekt(> PRIMARY KEY (person_fk, event_fk),
> pgslekt(> FOREIGN KEY (person_fk, event_fk) REFERENCES participants
> (person_fk, event_fk)
> pgslekt(> );
> NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
> "participant_notes_pkey" for table "participant_notes"
> CREATE TABLE
Note that this will limit you to one record in your participant notes
for each record in the participants table. If you need > 1 of those,
then you could either create a serial and use that for a PK, or PK on
person_fk, event_fk and part_not, assuming part_note doesn't get real
big. If it does you can PK on something like event, person, and
md5(part_note) or something along those lines.
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To: pgsql-sql@postgresql.org
Cc: scott.marlowe@gmail.com, leif@solumslekt.org
Subject: Re: DDL problems: Referential issue?
In-Reply-To: <dcc563d10911041203r61124e04gf22e7f22a8bbd09@mail.gmail.com>
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