Re: SQL question....

I think this is what you're looking for:

SELECT * FROM access
WHERE ip IN(SELECT ip FROM access
GROUP BY ip HAVING count(*) > 1)

On Tue, May 20, 2008 at 3:17 PM, Karl Denninger <karl(at)denninger(dot)net> wrote:

> chester c young wrote:
>
> 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.
>
>
>
>
> many ways:
>
> select a1.* from access a1 where exists(
> select 1 from access a2 where a2.name=a2.name and a1.ip!=a2.ip );
>
> select a1.*
> from access a1
> join access a2 using( name )
> where a1.ip != a2.ip;
>
>
>
> Those will return single entries as well (which is easy to do with an
> "ORDER BY", that is computationally simpler)
>
> What I want (and can't figure out) is a SELECT that returns ONLY tuples
> with two or more NAME entries that have the same IP.
>
> -- Karl
>