From: Jeffrey W. Baker <jwbaker@acm.org>
To: pgsql-performance@postgresql.org
Subject: Re: Index Usage using IN
Date: Wed, 01 Feb 2006 12:28:19 -0800
Message-ID: <1138825699.8376.8.camel@toonses.gghcwest.com> (raw)
In-Reply-To: <1138825370.8376.5.camel@toonses.gghcwest.com>
References: <43E1164B.7020104@telogis.com>
<1138825370.8376.5.camel@toonses.gghcwest.com>
On Wed, 2006-02-01 at 12:22 -0800, Jeffrey W. Baker wrote:
> On Thu, 2006-02-02 at 09:12 +1300, Ralph Mason wrote:
> > Hi,
> >
> > I have 2 tables both have an index on ID (both ID columns are an oid).
> >
> > I want to find only only rows in one and not the other.
> >
> > Select ID from TableA where ID not IN ( Select ID from Table B)
>
> Have you considered this:
>
> SELECT ID from TableA EXCEPT Select ID from Table B
Alternately:
SELECT a.ID
FROM TableA AS a
LEFT JOIN TableB AS b
ON a.ID = b.ID
WHERE b.ID IS NULL
-jwb
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To: pgsql-performance@postgresql.org
Cc: jwbaker@acm.org
Subject: Re: Index Usage using IN
In-Reply-To: <1138825699.8376.8.camel@toonses.gghcwest.com>
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