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Re: SQL question....

From: "Gurjeet Singh" <singh(dot)gurjeet(at)gmail(dot)com>
To: "Karl Denninger" <karl(at)denninger(dot)net>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: SQL question....
Date: 2008-05-20 20:57:59
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-sql
On Tue, May 20, 2008 at 11:44 PM, Karl Denninger <karl(at)denninger(dot)net> wrote:

> .... assuming the following schema:
> create table access (name text, address ip)
> I want to construct a SELECT statement which will return ONLY tuples
> containing IP and name pairs IF there is an IP that has two or more NAMEs
> associated with it.
> I've not figured out how to do this; I can get a list of all IPs and names
> ordered by IP, which I could then parse with a different program (e.g.
> "Select name, address from access order by address"), but the idea of course
> is to do it with one SELECT statement and return only rows that have
> multiple names listed for a given IP.
try this:

select ip, name from access where ip in ( select ip from access group by ip
having count(name) > 2);

heven't execued it, so may need some coaxing. Let me know the results.

Best regards,
singh(dot)gurjeet(at){ gmail | hotmail | indiatimes | yahoo }.com


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