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Consider a directed line(->) from the relationship set advisor to both entity sets instructor and student. This indicates _________ cardinality

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Consider a directed line(->) from the relationship set advisor to both entity sets instructor and student. This indicates _________ cardinality

(a) One to many

(b) One to one

(c) Many to many

(d) Many to one

I have been asked this question in an online interview.

My question comes from Entity-Relationship Diagrams topic in portion Database Systems Design and Implementation of Database Management

1 Answer

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Correct answer is (b) One to one

Easy explanation - This indicates that an instructor may advise at most one student, and a student may have at most one advisor.

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