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How we identify the relationship direction in Chen notation?. If we add A has B relationship then can anyone read it as B has A ?
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Chen's database notation is useful for modeling the basics of entities and relationships, because it presents an abstract view of the associations. These diagrams are a good entry step to understanding the database structure, especially for basic databases or examples.
You read the diagrams first from left to right and then from right to left. In the case of the name-address relationship in following figure, you read the relationships as follows: names can be associated with zero or exactly one address; addresses can be associated with zero, one, or many names.
Attributes are the properties or characteristics of entities. In Chen notation, one of the two most commonly used ways to draw an ERD, attributes are represented as an oval.
There are a number of notations used to present cardinality in ER diagrams. Chen, UML, Crow's foot, Bachman are some of the popular notations. Creately supports Chen, UML and Crow's foot notations.
I think I found an answer for my question after a long time. It is the name of the relationship which provides the direction of the relationship in chen's notation.
This image describe it well
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