Re: SQL question....

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