| From: | Christoph Haller <ch(at)rodos(dot)fzk(dot)de> |
|---|---|
| To: | dave-ml(at)dribin(dot)org, pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: One to many query question |
| Date: | 2003-07-31 07:42:48 |
| Message-ID: | 3F28C878.EE2EB806@rodos.fzk.de |
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| Thread: | |
| Lists: | pgsql-sql |
>
> On Wed, Jul 30, 2003 at 05:26:23PM -0400, Dmitry Tkach wrote:
> > >How do I write a query to find all CDs that are NOT Rock?
> > >
> > What about
> > select * from cd where not exists (select 1 from cd_genres where
cd_id
> > = cd.id and genre='Rock')?
>
> Thanks everyone! This did indeed work, and it does seem clearer. I
> never knew about EXISTS before. How portable is this? I'm interested
> in supporting PostgreSQL and MS SQL Server for now, and possibly
> Oracle and MySQL in the future.
>
It should be portable completely. It's SQL standard.
Regards, Christoph
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