Lesson 5 Relationship

3. Relationship

To understand what we mean by relationship among data item, we need some familiarity with data model terminology. An entity is a thing which can be easily identified.
It may be an object, place, person, concept or activity for which data need to be recorded.entity of student instructor

Note 
An association among entity lead to relationship.


Example
There is some relationship between instructor and student as seen in figure

This relationship respect the fact that instructor teaches several student, and a student taught by several instructors.

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