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Re: exclude part of result

From: "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: exclude part of result
Date: 2008-06-27 06:48:53
Message-ID: 20080627064853.GA14456@a-kretschmer.de (view raw or flat)
Thread:
Lists: pgsql-sql
am  Fri, dem 27.06.2008, um  0:35:38 +0100 mailte Tarlika Elisabeth Schmitz folgendes:
> 
> SELECT DISTINCT a, b, c, now(), count(item_pk) 
> FROM product
> LEFT JOIN item ON item.product_fk = product_pk
> WHERE ...
> GROUP BY a, b, c
> 
> 
> I have another table 'navigation' which also has the columns a,b,c
> 
> If the combination of (a,b,c) exists in 'navigation', then exclude it
> from above result. How can I achieve this?

For instance with EXCEPT.


Regards, Andreas
-- 
Andreas Kretschmer
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