fluent nhibernate join vs hasmany / manytomany

Question

whats the difference between using join() and using hasmany mappings to map entities. Can I get same results using both of these features--- I would think Join() would let you think data driven way?

Answer 1

Join is completely unrelated to one-to-many and many-to-many's. It's for composing an entity from 2 or more tables. See the NHibernate docs on join.