On Wednesday, March 28, 2018, JORGE MALDONADO <jorgemal1960(at)gmail(dot)com>
wrote:
>
> The table "corequisites" has data about courses that must be taken at the
> same time that another course.
>
>
>
>
I would consider setting up corequisites as (id serial,
course_group_members integer[]) with an exclusion constraint that no
course_id can appear in more than one array.
David J.