Lesson 7 One to many 1:m

      b) One to many (1:m)

One to many relationships exists when one entity is related to more than one entity. For example:-

1.      Father may have many children but a child have only one father.

2.      Two entities set namely courses & teacher, if you assume that more than one Subject or course is taught by a teacher, and then a relationship is one to many between teacher & courses.