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

one to many is two tables.

the second one is many to many.

Authors
1 Larry Niven
2 Jerry Pournelle

Books
1 Integral Trees
2 King David's Spaceship
3 The Mote in God's eye

AuthorsBooks
1 1
2 2
1 3
2 3