10 Questions
Which of the following is a primary key for the Authors entity?
AuthorID
What is the purpose of the 'Borrowing' entity in the simplified ER diagram?
To store details such as BorrowDate and ReturnDate
What does 'PK' stand for in the context of the ER diagram explained?
Primary Key
In the library system described, what kind of relationship exists between Books and Authors?
Many-to-many relationship
What attribute in the Users entity acts as a unique identifier for each user in the library system?
UserID
Which view can be queried to obtain information about the Oracle database's data files?
V$DATABASE
What does the 'Written_By' relationship with a cardinality of '1, M' indicate?
Each book can be written by multiple authors
What does the 'Borrowed_By' relationship with a cardinality of '0, M' signify?
A user can borrow multiple books
What do the connectors in an ER diagram represent?
Relationships between entities
Why is understanding the elements of an ER diagram crucial for designing and understanding database schemas?
To visualize the interconnections between entities
This quiz covers the concept of many-to-many relationships in database design, using an associative entity to represent the relationship between Books and Users. It also discusses the use of foreign keys and relevant borrowing details in the associative entity. The quiz further explores the simplified ER diagram representation of Books, Authors, and Users as separate entities, along with the relationships between them.
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