Applications & Awareness in Technology

To draw an Entity-Relationship (E-R) diagram for the described Book Club scenario, we need to identify the entities, relationships, and cardinalities. Here’s a breakdown of the entities and their relationships:

Entities:

1. Member
2. Order
3. Book
4. Author
5. Publisher

Relationships:

1. Places: Between Member and Order
2. Contains: Between Order and Book
3. Writes: Between Author and Book
4. Publishes: Between Publisher and Book

Cardinalities:

1. A Member can place zero or more Orders.
2. An Order contains one or more Books.
3. A Book can be written by one or more Authors.
4. An Author can write one or more Books.
5. A Book is published by one Publisher.
6. A Publisher can publish one or more Books.

Assumptions:

• Each Order is placed by one Member.
• Each Book is contained in one or more Orders.

Here’s the E-R diagram representation in text form:

• Member (MemberID, Name, Email)
• Order (OrderID, OrderDate, MemberID)
  • Member and Order have a one-to-many relationship (One Member places many Orders).
• Book (BookID, Title, PublisherID)
  • Order and Book have a many-to-many relationship through a junction table (OrderDetails with OrderID and BookID).
• Author (AuthorID, Name)
  • Book and Author have a many-to-many relationship through a junction table (BookAuthors with BookID and AuthorID).
• Publisher (PublisherID, Name, Address)
  • Publisher and Book have a one-to-many relationship (One Publisher publishes many Books).

Description:

• Member (MemberID, Name, Email)
  • A Member entity with attributes MemberID, Name, and Email.
  • One-to-Many relationship (Places) with Order.
• Order (OrderID, OrderDate, MemberID)
  • An Order entity with attributes OrderID, OrderDate, and MemberID (foreign key).
  • Many-to-Many relationship (Contains) with Book through OrderDetails.
• OrderDetails (OrderID, BookID)
  • Junction table to represent the many-to-many relationship between Order and Book.
  • Contains attributes OrderID and BookID (foreign keys).
• Book (BookID, Title, PublisherID)
  • A Book entity with attributes BookID, Title, and PublisherID (foreign key).
  • Many-to-Many relationship (Written by) with Author through BookAuthors.
• Author (AuthorID, Name)
  • An Author entity with attributes AuthorID and Name.
  • Many-to-Many relationship (Writes) with Book through BookAuthors.
• BookAuthors (BookID, AuthorID)
  • Junction table to represent the many-to-many relationship between Book and Author.
  • Contains attributes BookID and AuthorID (foreign keys).
• Publisher (PublisherID, Name, Address)
  • A Publisher entity with attributes PublisherID, Name, and Address.
  • One-to-Many relationship (Publishes) with Book.