Cascading list of values with a many-to-many relationship

Hi all

I have three paintings; semester, subject and half of subject. Each semester has a lot of topics and a subject can be taught in several semesters.

create table semester(
     id number not null,
     name varchar2(50) not null,
     primary key(id)
);
create table subject(
     id number not null,
     name varchar2(50) not not null,
     primary key(id)
);
create table semester_subject(
     id number not null,
     semester_id number not null,
     subject_id number not null,
     primary key(id),
     foreign key(semester_id) references semester(id),
     foreign key(subject_id) references subject(id),
     constraint semester_subject_uq unique(semester_id, subject_id)
);

EDIT: I have a page with a report that shows all students who are currently enrolled in the selected for the selected session object.

There are two selection lists at the top of the report, one for the half and the other for the subject.

What I try to do is when you select a semester in the half selection list, the topic selection list should contain only the subjects for the half of some (not all) in the subject of the painting.

h

If the relationship was of 1 to many that I could write to see half of value

select name, id
from semester
order by 1

and for the purpose of value list

select name, id
from subject
where semester_id = :PX_SEMESTER

But now that the relationship depends on the table of semester_subject, I can't find a way to achieve this and Googling has not helped.

Thanks in advance for any help.

I believe that this issue has also been implemented on stack overflow plsql - list of values cascading with many-to-many relationship - stack overflow and received a very wide response. If the OP has not yet verified, he may want to.

(FYI: I'm not the person who answered there.)

Tags: Database

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