type of cardinality relationship

example of many-to-many relationship

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

example of one-to-one relationship

One person has one passport.

one-to-many relationship

each row in the related table can be related to many rows in the relating table

example of one-to-many relationship

one mother can have many child, each child will only have one biological mother

one-to-one relationship

refers to relationships of two items in which one can only belong with the other.

many-to-many relationship

type of cardinality that refers to the relationship between two entities A and B in which A may contain a parent instance for which there are many children in B and vice versa.