(Oracle Apex ver. 12 c) How to create an LOV from one table that displays another table as results

Question

I have to create a list of values, three separate symptoms, that would return likely illnesses from another table that has related symptoms. Any idea how to go about this?

Answer 1

It sounds like what you are looking for is simply a report (as well as your 2 LOV items), with a query like:

select * from illnesses i
where exists (select null 
              from illness_symptoms s1
              where s1.illness_id = i.illness_id
                and s1.symptom = :P123_SYMPTOM1
             )
and exists (select null 
            from illness_symptoms s2
            where s2.illness_id = i.illness_id
              and s2.symptom = :P123_SYMPTOM2
             )

This could in fact be a cascading LOV instead of a report, if that's what you need, with the symtom LOVs as its parents.