From: Troels Arvin <troels@arvin.dk>
To: pgsql-sql@postgresql.org
Subject: Immutable attributes?
Date: Tue, 01 Jul 2003 11:59:24 +0200
Message-ID: <pan.2003.07.01.09.59.23.580853@arvin.dk> (raw)
Hello,
I have a table like this:
create table test (
"test_id" serial primary key,
"created" timestamp with time zone
default current_timestamp
check(created = current_timestamp),
"some_datum" int not null
);
My question concerns the "created" attribute: I want this to reflect when
the tuple was craeated; and I want to make sure that the timestamp is not
wrong. That will work with the above schema. However, I also want to make
sure that the "crated" attribut for a tuple is not changed once it has
been set.
I'm thinking about implementing it through a trigger, but is there a
better way to create such "immutable" attributes?
/Troels
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To: pgsql-sql@postgresql.org
Cc: troels@arvin.dk
Subject: Re: Immutable attributes?
In-Reply-To: <pan.2003.07.01.09.59.23.580853@arvin.dk>
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