Possible to do conditional ands?

Question

I don't know if this is possible or not. so I thought I should ask the experts.
I have a function and I need to create a query that has conditional ands.
what I'm looking for is something like this:
the function has a few in variables. one of them is p_view
in my where clause I was hoping to do something like this:
where a.course_id = b.course=id
if p_view = 1 then
and a.supervisor = p_super
elseif view = 2 then
and a.emplid = p_emplid
else
and a.emplid = b.emplid
end if;
and a.role = b.role;
now this is not real code, I've tried a decode and that did not work, then tried case, that did not work. so I'm not sure if its possible or not.
can this be done or is there some other way to do this I don't know about?

Answer 1

Hi,
I've tried a decode and that did not work, then tried case, that did not work.Why not? How did you try?
When asking questions, be as specific, clear and concisive as possible, so we can help you as best as possible.
'It didn't work' isn't adding anything to that.
now this is not real codeDon't post unreal/syntactically wrong code, it only distracts and confuses, raises more questions.
Post real code or a clear description of the requirement.
can this be done or is there some other way to do this I don't know about?Hm...my guess is that it can be done, and I wouldn't rule out getting it done using case yet.
If possible, please provide the real query and explain why 'it didn't work'.
We need to know the requirement here.
All I can think of with your given input is this wild shot in the dark, however it might give you an idea:
where a.course_id = b.course_id
and ( case
        when p_view = 1 and a.supervisor = p_super then 1
        when p_view = 2 and a.emplid = p_emplid then 1
      end
    )  = 1
and a.emplid = b.emplid --not sure about this here at all
and a.role = b.role;Remember to use the tag before and after your examples.