The ER diagram has to be traditional er diagram with rectangles for entitites, ovals for attributes, likes, diamonds for relationships$),$ etc.

Consider an online bookstore that sells books to customers. The bookstore has multiple book categories and many customers who can place orders. For this online bookstore consider the following information:

$$ Book: Represents a book in the bookstore. Contains attributes such as title, author, ISBN, and price.

$$ Category: Represents a category or genre of books in the bookstore. Contains attributes such as name and description.

$$ Customer: Represents a customer who has registered with the bookstore. Contains attributes such as name, address, and email.

$$ Order: Represents an order placed by a customer. Contains attributes such as order date and total price. Also has a foreign key reference to the Customer entity, indicating which customer placed the order.

$$ Book$\_$Category: Represents the many$-$to$-$many relationship between books and categories.

Contains foreign key references to both the Book and Category entities.

$$ Order$\_$Book: Represents the many$-$to$-$many relationship between orders and books. Contains foreign key references to both the Order and Book entities.

$$ One book can belong to multiple categories $($Many$-$to$-$Many$).$

$$ One category can have multiple books $($One$-$to$-$Many$).$

$$ One customer can place multiple orders $($One$-$to$-$Many$).$

$$ One order can contain multiple books $($Many$-$to$-$Many$)$

The diagram has to be traditional er diagram with rectangles for entitites, ovals for attributes, likes, diamonds for relationships$),$ etc.