I am very new to this and i still don’t know how to do it correctly. would you help me write a simple ER to represent the following database and conditions?
an university database who saves information on students, identified by stuident id, courses that are identified by course id and students who learn courses. there is also a status entity “studies” if a student studies a course. students can learn the same course in different semesters, but the record i kept only of the last semester.
the conditions(each irrelavant to the previous one)
1)each student must study at least one course.
2)each student studies exactly one course.
3) each student studies exactly one course and every coure must have a student studying it.
(3 different ER). regrading 3, i really don’t know how to represent it.
would you help me with that please?
thank you very much for helping a noob
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