many-to-many

avoid it

• https://stackoverflow.com/questions/37716874/how-to-avoid-many-to-many-relationships

drawbacks

• http://www.sqa.org.uk/e-learning/SDM03CD/page_37.htm

design

-https://www.dataversity.net/more-database-design-errors-confusion-with-many-to-many-relationships/

examples

queries