From: | Hans-Jürgen Schönig <hs(at)cybertec(dot)at> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: Distinct Values |
Date: | 2001-06-05 09:18:42 |
Message-ID: | 3B1CA3F2.11015CC7@cybertec.at |
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Thread: | |
Lists: | pgsql-sql |
Nicolas schrieb:
> Hi,
>
> I'm trying to retreive DISTINCT Values from a two colomn table called
> "Books". The colomns are named "Author" and "URL".
> DISTINCT values should be retieved from the "Author" Colomn , and then I
> should be able to retrieve the corresponding URL.
> How do I build the SQL Query ?
> I tried to use: "SELECT DISTINCT Author FROM Books" But this does not allow
> me to fetch the URL value on the other colomn.
>
> Thanks
> Nicolas
The problem is that one author may have multiple urls - if you want to select
the url too, the database does not know which url to retrieve.
Hans
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