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Many-to-Many Relationship in Database Design

10 Questions

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Many-to-Many Relationship in Database Design

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Questions and Answers

Which of the following is a primary key for the Authors entity?

BookID

AuthorID (correct)

UserID

Name

What is the purpose of the 'Borrowing' entity in the simplified ER diagram?

To store details such as BorrowDate and ReturnDate (correct)

To represent the relationship between books, authors, and users

To capture the basic functionalities of a library system

To link Books and Authors

What does 'PK' stand for in the context of the ER diagram explained?

Personal Knowledge

Public Key

Primary Key (correct)

Primary Knowledge

In the library system described, what kind of relationship exists between Books and Authors?

Many-to-many relationship Signup and view all the answers

What attribute in the Users entity acts as a unique identifier for each user in the library system?

UserID Signup and view all the answers

Which view can be queried to obtain information about the Oracle database's data files?

V$DATABASE Signup and view all the answers

What does the 'Written_By' relationship with a cardinality of '1, M' indicate?

Each book can be written by multiple authors Signup and view all the answers

What does the 'Borrowed_By' relationship with a cardinality of '0, M' signify?

A user can borrow multiple books Signup and view all the answers

What do the connectors in an ER diagram represent?

Relationships between entities Signup and view all the answers

Why is understanding the elements of an ER diagram crucial for designing and understanding database schemas?

To visualize the interconnections between entities Signup and view all the answers