From: Jasen Betts <jasen@xnet.co.nz>
To: pgsql-sql@postgresql.org
Subject: Re: self join
Date: 15 May 2011 02:36:46 GMT
Message-ID: <iqne7u$ssa$2@reversiblemaps.ath.cx> (raw)
References: <87y629rl34.fsf@kolob.subpolar.dyndns.org>
On 2011-05-14, Seb <spluque@gmail.com> wrote:
> Hi,
>
> This probably reflects my confusion with how self joins work.
>
> Suppose we have this table:
> If I want to get a table with records where none of the values in column
> b are found in column a, I thought this should do it:
use the "NOT IN" operator with a subquery to retch the disallowed
values.
select * from tmp where a NOT IN (select b from tmp);
--
⚂⚃ 100% natural
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To: pgsql-sql@postgresql.org
Cc: jasen@xnet.co.nz
Subject: Re: self join
In-Reply-To: <iqne7u$ssa$2@reversiblemaps.ath.cx>
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