Given a relation scheme with the condition that author can write many books and a book must be published by one publisher, sketch an Entity Relationship Model (ERD) using Chen’s Model.
Question
Given a relation scheme with the condition that author can write many books and a book must be published by one publisher, sketch an Entity Relationship Model (ERD) using Chen’s Model.
Solution
To sketch an Entity Relationship Model (ERD) using Chen’s Model for the given scenario, follow these steps:
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Identify the Entities: In this scenario, the entities are "Author", "Book", and "Publisher".
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Identify the Relationships: The relationships are "Author writes Book" and "Book is published by Publisher".
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Identify the Cardinality: For the relationship "Author writes Book", the cardinality is one-to-many (1:M) as one author can write many books. For the relationship "Book is published by Publisher", the cardinality is many-to-one (M:1) as many books can be published by one publisher.
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Draw the ERD:
- Draw three rectangles and label them as "Author", "Book", and "Publisher" to represent the entities.
- Draw a diamond between "Author" and "Book" and label it as "writes" to represent the relationship. Draw a line connecting "Author" and "writes" and another line connecting "writes" and "Book". Add an arrow pointing towards "Book" to represent the one-to-many relationship.
- Draw another diamond between "Book" and "Publisher" and label it as "is published by" to represent the relationship. Draw a line connecting "Book" and "is published by" and another line connecting "is published by" and "Publisher". Add an arrow pointing towards "Publisher" to represent the many-to-one relationship.
Please note that this is a text-based explanation. In a real scenario, you would draw this on a piece of paper or use a software tool designed for creating ERDs.
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