From: Ragnar Hafstað <gnari@simnet.is>
To: Kenneth Gonsalves <lawgon@thenilgiris.com>
Cc: Richard Huxton <dev@archonet.com>
Cc: weberp@paradise.net.nz
Cc: pgsql-sql@postgresql.org
Subject: Re: Query performance problem
Date: Fri, 18 Mar 2005 07:32:52 +0000
Message-ID: <1111131172.25405.17.camel@localhost.localdomain> (raw)
In-Reply-To: <200503181049.47566.lawgon@thenilgiris.com>
References: <200503172120.20676.weberp@paradise.net.nz>
<200503171801.19412.lawgon@thenilgiris.com>
<42398EB9.2050707@archonet.com>
<200503181049.47566.lawgon@thenilgiris.com>
On Fri, 2005-03-18 at 10:49 +0530, Kenneth Gonsalves wrote:
> On Thursday 17 Mar 2005 7:35 pm, Richard Huxton wrote:
>
> > Not necessarily. NOT NULL here helps to ensure you can add values
> > together without the risk of a null result. There are plenty of
> > "amount" columns that should be not-null (total spent, total
> > ordered etc).
>
> that makes sense - but is it necessary to have a not null constraint
> when there is a default value?
DEFAULT applies to INSERTs, NOT NULL applies to UPDATEs too.
gnari
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To: pgsql-sql@postgresql.org
Cc: gnari@simnet.is, lawgon@thenilgiris.com, dev@archonet.com, weberp@paradise.net.nz
Subject: Re: Query performance problem
In-Reply-To: <1111131172.25405.17.camel@localhost.localdomain>
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