SQL Database with variable number of columns

Question

I have a newbie question about a database I am trying to create. I have a list of publications, with this general order:

UID, Author, URL, Title, Publication, start page

Answer 1

You have many to many relationship between entity Publication and entity Author. Publication can have many authors, author can have many publications.

So, you should create table for this relationship. For example table Authors_Publications with columns: UID, author_id, publication_id, order