We are going to design a library system with E/R diagrams. It should satisfy the following requirements. 1. At any time, the borrower can check the variety, quantity and location of the books in the library. All kinds of books can be uniquely identified by the ISBN. 2. The system can check the status of borrowing and returning books at any time, including the name of the borrower, the number of the loan card, the date of borrowing books and the date of returning books. 3. Anyone can borrow many kinds of books, any kind of book can be borrowed by multiple people, and the library card number is unique. 4. When necessary, additional books can be purchased from the corresponding publisher through the publisher's telegram number, telephone number, zip code, and address stored in the database. 5. We have agreed that a publishing house can publish multiple books, and the same book is only published by one publishing house, and the name of the publishing house is unique. (1). Please draw the E/R diagram. (2). From your diagram, please select ONE Relation and write the code to create the table (only one table).

Database System Concepts
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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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## Designing a Library System with E/R Diagrams

The objective is to design a library system using Entity-Relationship (E/R) diagrams following the specified requirements. 

### Requirements:

1. **Books Inventory Check**
   - At any given time, the borrower can check the variety, quantity, and location of books in the library.
   - All books can be uniquely identified by their ISBN.

2. **Borrowing and Returning Books**
   - The system allows checking the status of borrowed and returned books at any time.
   - Information includes:
     - Name of the borrower
     - Loan card number
     - Date of borrowing
     - Date of returning books

3. **Borrowing Rules**
   - Any person can borrow multiple types of books.
   - Any book can be borrowed by multiple people.
   - The library card number is unique for each borrower.

4. **Publisher Information**
   - Additional books can be acquired from publishers as needed.
   - The system stores publisher information including:
     - Telegram number
     - Telephone number
     - Zip code
     - Address

5. **Publishing Houses**
   - A publishing house can publish multiple books.
   - Each book is published by one single publishing house.
   - The publishing house’s name is unique.

### Tasks:

1. **Draw the E/R Diagram.**
   - You need to create an E/R diagram that represents the above requirements.

2. **Select ONE Relation and Create the Corresponding Table.**
   - From your E/R diagram, select one relation.
   - Write the SQL code to create the table for the chosen relation.

### Explanation of E/R Diagram Elements:
- **Entities**:
  - **Books**: Attributes include ISBN (unique identifier), title, author, location in the library.
  - **Borrowers**: Attributes include name, unique library card number.
  - **Loan**: Attributes include loan card number, borrowing date, returning date.
  - **Publisher**: Attributes include telegram number, telephone number, zip code, and address.

- **Relationships**:
  - **Borrowing**: Connects Borrowers and Books, indicating the borrowing and returning dates.
  - **Published By**: Connects Books and Publisher, indicating which publisher published the book.

Here is an example of how you might draw and explain a simple E/R diagram meeting these requirements:

```
Entities:
1. Book
   - ISBN : Key
Transcribed Image Text:## Designing a Library System with E/R Diagrams The objective is to design a library system using Entity-Relationship (E/R) diagrams following the specified requirements. ### Requirements: 1. **Books Inventory Check** - At any given time, the borrower can check the variety, quantity, and location of books in the library. - All books can be uniquely identified by their ISBN. 2. **Borrowing and Returning Books** - The system allows checking the status of borrowed and returned books at any time. - Information includes: - Name of the borrower - Loan card number - Date of borrowing - Date of returning books 3. **Borrowing Rules** - Any person can borrow multiple types of books. - Any book can be borrowed by multiple people. - The library card number is unique for each borrower. 4. **Publisher Information** - Additional books can be acquired from publishers as needed. - The system stores publisher information including: - Telegram number - Telephone number - Zip code - Address 5. **Publishing Houses** - A publishing house can publish multiple books. - Each book is published by one single publishing house. - The publishing house’s name is unique. ### Tasks: 1. **Draw the E/R Diagram.** - You need to create an E/R diagram that represents the above requirements. 2. **Select ONE Relation and Create the Corresponding Table.** - From your E/R diagram, select one relation. - Write the SQL code to create the table for the chosen relation. ### Explanation of E/R Diagram Elements: - **Entities**: - **Books**: Attributes include ISBN (unique identifier), title, author, location in the library. - **Borrowers**: Attributes include name, unique library card number. - **Loan**: Attributes include loan card number, borrowing date, returning date. - **Publisher**: Attributes include telegram number, telephone number, zip code, and address. - **Relationships**: - **Borrowing**: Connects Borrowers and Books, indicating the borrowing and returning dates. - **Published By**: Connects Books and Publisher, indicating which publisher published the book. Here is an example of how you might draw and explain a simple E/R diagram meeting these requirements: ``` Entities: 1. Book - ISBN : Key
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