Hi Darrell,
SELECT DISTINCT articleID FROM tags WHERE tag = "a"
EXCEPT
SELECT DISTINCT articleID FROM tags WHERE tag = "b";
Regards,
Andreas
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Von: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org] Im Auftrag von 8q5tmkyqry@sneakemail.com
Gesendet: Montag, 1. Februar 2010 14:32
An: pgsql-sql@postgresql.org
Betreff: [SQL] selecting rows tagged with "a" but not "b"
Hi,
I have a two tables:
article
articleID, name, content
tags
articleID, tag
I want to find all articles that are tagged with "a" but not "b"
how do I do this?
what I'd like to do is:
<wishful thinking>
select articleID from tags where tag="a"
SUBTRACT
select articleID from tags where tab="b"
</wishful thinking>
how do I do this in real SQL?
thanks
Darrell
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