Entity-Relationship diagram: Entity-Relationship (ER) diagram is the method to represent the relational database using graphical form. This graphical representation shows only primary elements such as records, types, attributes, relationships between entities, and so on. The graphical representation of the ER diagram clearly describes the relationship among entities. In the diagram, every connector is labeled. On one side it is represented by the value “1”, and on the other side it is labeled with the value “M”. This labeling is referred to as “cardinality constraint” of the relationship. Relationships between entities have some restrictions. At a time, there can exist only three types of cardinality relationships, they are as follows: One-to-one: In this relationship, one row in the database table is linked with one row in another database table. One-to-many: In this relationship, one row in the database table is linked with more than one row in another database table. Many-to-many: In this relationship, more than one row in the database table is linked with more than one row in another database table.

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Chapter 12, Problem 60E

Program Plan Intro

Entity-Relationship diagram:

Entity-Relationship (ER) diagram is the method to represent the relational database using graphical form.

This graphical representation shows only primary elements such as records, types, attributes, relationships between entities, and so on.

The graphical representation of the ER diagram clearly describes the relationship among entities.

In the diagram, every connector is labeled.

On one side it is represented by the value “1”, and on the other side it is labeled with the value “M”. This labeling is referred to as “cardinality constraint” of the relationship.

Relationships between entities have some restrictions.

At a time, there can exist only three types of cardinality relationships, they are as follows:

One-to-one: In this relationship, one row in the database table is linked with one row in another database table.

One-to-many: In this relationship, one row in the database table is linked with more than one row in another database table.

Many-to-many: In this relationship, more than one row in the database table is linked with more than one row in another database table.

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