SQL correct way of joining if the other parameter is null

Question

I have this code and its temporary tables so you can run it.

create table #student
(
    id int identity(1,1),
    firstname varchar(50),
    lastname varchar(50         


        

Answer 1

Pretty sure you want something along these lines. This will give you the quiz values and return NULL for the student and quiz_details when there is no matching data.

select *
from #quiz q
left join #quiz_details qd on q.id = qd.quiz_id
left join #student s on s.id = qd.student_id