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A relationship between two entities signifies that the two entities are associated with each other somehow. For example, a student might enroll in a course.
The entity Student is therefore related to Course, and a relationship is presented as a connector connecting between them. Cardinality defines the possible number of occurrences in one entity which is associated with the number of occurrences in another.
When present in an ERD, the entity Team and Player are inter-connected with a one-to-many relationship. In an ER diagram, cardinality is represented as a crow's foot at the connector's ends.
The three common cardinal relationships are one-to-one, one-to-many, and many-to-many. A one-to-one relationship is mostly used to split an entity in two to provide information concisely and make it more understandable.
The figure below shows an example of a one-to-one relationship. A one-to-many relationship refers to the relationship between two entities X and Y in which an instance of X may be linked to many instances of Y, but an instance of Y is linked to only one instance of X.
The figure below shows an example of a one-to-many relationship. A many-to-many relationship refers to the relationship between two entities X and Y in which X may be linked to many instances of Y and vice versa.
The figure below shows an example of a many-to-many relationship. Note that a many-to-many relationship is split into a pair of one-to-many relationships in a physical ERD.
You will know what a physical ERD is in the next section. While all the three levels of an ER model contain entities with attributes and relationships, they differ in the purposes they are created for and the audiences they are meant to target.
A general understanding to the three data models is that business analyst uses a conceptual and logical model to model the business objects exist in the system, while database designer or database engineer elaborates the conceptual and logical ER model to produce the physical model that presents the physical database structure ready for database creation.
The table below shows the difference between the three data models. Conceptual ERD models the business objects that should exist in a system and the relationships between them.
A conceptual model is developed to present an overall picture of the system by recognizing the business objects involved.
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