one to many relationship in database - design concept

Question

A one to many relationship between two tables should be implemented with two or three tables? For example should we have:

author(id,otherAttributtes)
books(i         


        

Answer 1

A one-to-many relationship should be implemented with 2 tables.

But the relationship you propose in your example (between Authors and Books) is not one-to-many, is many-to-many.

"An Author can write many Books, and a Book can be written by one or more Authors."

And a many-to-many relationship should be implemented with 3 tables.

Have a good day.