Qualify unique values from a tale column

This is completely eluding me.

I want to qualify based on unique values from a column in a table, like

Have a table User with a column ipAddress, in the table there can be more 
that one user by the same name with the same
ipAddress but a different table id.

User Table example

User john ip 111 id 1 (simplified for demonstration)
User Bart ip 222 id 2
User Elsa ip 333 id 3
User john ip 111 id 4

With the EOQualifier, I would like to get the result for table id's 1, 2 
and 3 but not 4, or it could also be id's 2, 3 and 4 but not 1.

I know how to do the sort in memory, but I don't want to fetch all the 
tables to memory, I want to qualify them at the DB level.

Thanks

Sigthor