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 should create author table which is many-to-many relation with the publication table

Author have some information and publication also have informaiton

so should have tables like author and publication both have primary key like author_id and pblication_id and both key having many-to-many relationship