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Find sources: "Many-to-many" data model – news · newspapers · books · scholar · JSTOR (January 2013) (Learn how and when to remove this message)

An Author can write several Books, and a Book can be written by several Authors

The Author-Book many-to-many relationship as a pair of one-to-many relationships with a junction table

In systems analysis, a many-to-many relationship is a type of cardinality that refers to the relationship between two entities,^[1] say, A and B, where A may contain a parent instance for which there are many children in B and vice versa.

^ Also see entity–relationship model.