Many-to-Many relationships needing an associate table

Question

In many database design tutorials/articles, they always bring up the fact that if two tables share a many-to-many relationship, then a third table should be created to act as an

Answer 1

It would not flexible if DB-Server could create 3rd table for you. If there will be a solution like that, you wouldn't have much influence to

• change relation behavour

• store other association information in assoc. table

• performance enhancements

• storage enhancements