Re: selecting rows tagged with "a" but not "b" - Mailing list pgsql-sql

8q5tmkyqry@sneakemail.com <8q5tmkyqry@sneakemail.com> wrote:

> 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?

select a.* from article left join tags t on a.articleID=t.articleID where b.tag = 'a';



Andreas
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