Diagram of Library Management System

Diagram of Library Management System

The library management system has a database that shows the relationships between the entities such as a book, publisher, and member. Since this is a simple system, it has only three entities.

Entities and Attributes

? Book Entity: It has author, book_ID, title, price, and availability.

? Publisher Entity: It has publisher_ID, publisher_address, and publisher_name.

? Member Entity: It has member_ID, member_date, member_type, member_address, member_name, and expiry_date.

3. ER Diagram of Online Shopping System

Entities and Attributes

? Website/Application Entity: Attributes are domain name and app name.

? Customer Entity: Attributes are username, password, email address, mobile number, country name, district, address, C_id.

? Products Entity: Attributes are product ID, P_name, P_category, P_price, P_availability.

? Admin Entity: Attributes are username, password, A_id.

? Shopping Cart Entity: Attributes are product id, product name, total price, billing products.

? Registration Entity: Attributes are user id, username, password, forgot password, signup.

The Correct Answer and Explanation is :

ER Diagram of Library Management System

Entities and Attributes:

1. Book Entity:

• Attributes:
  • author
  • book_ID (Primary Key)
  • title
  • price
  • availability
  The Book entity holds details about books available in the library. book_ID is the unique identifier for each book, and availability indicates whether the book is currently available or checked out.

1. Publisher Entity:

• Attributes:
  • publisher_ID (Primary Key)
  • publisher_address
  • publisher_name
  The Publisher entity represents the publisher of books. publisher_ID uniquely identifies each publisher.

1. Member Entity:

• Attributes:
  • member_ID (Primary Key)
  • member_date
  • member_type
  • member_address
  • member_name
  • expiry_date
  The Member entity stores information about library members. member_ID is a unique identifier for each member, and expiry_date specifies when the membership expires.

Relationships:

• A Member can borrow multiple Books, forming a one-to-many relationship from Member to Book.
• A Publisher can publish multiple Books, forming a one-to-many relationship from Publisher to Book.

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ER Diagram of Online Shopping System

Entities and Attributes:

1. Website/Application Entity:

• Attributes:
  • domain_name
  • app_name
  Represents the online platform for shopping.

1. Customer Entity:

• Attributes:
  • username
  • password
  • email address
  • mobile number
  • country name
  • district
  • address
  • C_id (Primary Key)
  Represents customers who use the online shopping platform. The unique identifier is C_id.

1. Products Entity:

• Attributes:
  • product_ID (Primary Key)
  • P_name
  • P_category
  • P_price
  • P_availability
  Contains details about the products available for purchase. Each product has a unique product_ID.

1. Admin Entity:

• Attributes:
  • username
  • password
  • A_id (Primary Key)
  Represents administrators who manage the platform.

1. Shopping Cart Entity:

• Attributes:
  • product_id
  • product_name
  • total_price
  • billing_products
  Represents the cart where customers add products for purchase.

1. Registration Entity:

• Attributes:
  • user_id
  • username
  • password
  • forgot_password
  • signup
  Manages user registration on the platform.

Relationships:

• A Customer can have many Shopping Carts, representing a one-to-many relationship.
• A Shopping Cart can contain multiple Products, forming a many-to-many relationship between Products and Shopping Cart.
• A Customer can make multiple Registrations, which might form a one-to-many relationship if registration details are tracked over time.

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Explanation

The Library Management System involves managing books, publishers, and members. Relationships are primarily one-to-many: a publisher can publish many books, and a member can borrow multiple books.

In the Online Shopping System, the relationships are more complex:

1. The Customer can register, manage a shopping cart, and purchase many products, forming one-to-many or many-to-many relationships with other entities like Products and Shopping Cart.
2. Products and Shopping Cart have a many-to-many relationship, where each cart can have multiple products, and a product can appear in multiple carts.
3. Admin manages the platform, ensuring proper admin privileges.

Both systems rely on entities with well-defined relationships to manage various processes efficiently. The Library system is more focused on borrowing books, while the Online Shopping system supports registration, cart management, and product purchases.