Query to retrieve the records which have more than one assignment_id

Question

Hello,
I am trying to write a query to retrieve all the records from the table per_all_assignments_f which has more than one different assignment_id for each person_id. Below is the query i have written but this retrieves the records even if a person_id has duplicate assignment_id's but i need records which have more than one assignement_id with no duplicates for each person_id
select assignment_id ,person_id, assignment_id
From per_all_assignments_f
having count(assignment_id) >1
group by person_id, assignment_id
Thank You.
PK

Answer 1

Maybe something like this?
select *
From   per_all_assignments_f f1
where  exists (select 1
               from   per_all_assignments_f f2
               where  f2.person_id = f1.person_id
               and    f2.assignment_id != f1.assignment_id
              );Edited by: SomeoneElse on May 7, 2010 2:23 PM
(you can add a DISTINCT to the outer query if you need to)