ITPEC IP October 2022 Question 29
ITPEC IP October 2022 — Question 29 of 100
The relationships are Publishing Company to Author and Author to Book, both one-to-many. One publishing company contracts with many authors, while each author has only one publisher. One author writes many books, while each book has exactly one author. In the supplied notation, arrows point from the one side to the many side.
Answer (a)
Why not others:
- reversing the first arrow would imply many publishers per author
- reversing the second would imply many authors per book
- choices (b), (c), and (d) reverse at least one required relationship
Key rule: Translate each pair of statements into cardinality independently, then combine the two one-to-many relationships.
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