Many to Many Relation Design - Intersection Table Design

Question

I\'m wondering what a better design is for the intersection table for a many-to-many relationship.

The two approaches I am considering are:

CREATE TA         


        

Answer 1

It's a topic of some debate. I prefer the first form because I consider it better to be able to look up the mapping row by a single value, and like to enforce a perhaps-foolish consistency of having a single-column primary key available in every table without fail. Others think that having that column is a silly waste of space.

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