1.5 Marks
                Learning     Outcome(s):
Create entity-relationship     model, relational model, and write SQL queries
 
 
 
 
 
 
      Question One

Consider the below schema for a library database and write relational algebra expressions for the following queries  

  

   

1. Author ( authorname, citizenship, birthyear) 

2. Book (isbn, title, authorname)

3. Topic (isbn, subject)

4. Branch (libname, city)

5. Instock (isbn, libname, quantity)

1. Give all authors’ names born after 1940. [0.25 Point]

2. Give the names of libraries in Sydney. [0.25 Point]

3. Give the city/cities and “isbn” where each book is held.    [0.25 Point]

4. Give the title of each book on the topic of either alcohol or drugs. [0.25 Point]

5. Give the title and author of each book of which at least two copies are held in a branch located in Melbourne.  [0.50 Point]

   

                        1 Mark
                Learning     Outcome(s):
Explain database concepts,     systems, and architectures
 
 
 
 
 
      Question Two

What is the different between the database schema and the database instance? Give an example for each.

   

                        1 Mark
                Learning     Outcome(s):
Design a database starting from     the conceptual design to the implementation of database schemas
 
 
 
 
 
      Question Three

Name at least three tables that might be used to store information in the following systems:

a. An e-commerce system such as Amazon.  [0.25 Point]

b. A social media system such as Twitter.    [0.25 Point]

c. A health care system. [0.25 Point]

d. A university system. [0.25 Point]

   

                        1.5 Marks
                Learning     Outcome(s):
Create entity-relationship     model, relational model, and write SQL queries
 
 
 
 
      Question Four

Given the relation below named Contact_Info, answer the following questions:

  

SSN

Name

Phone

Email

Age

 

234-356

Sara Fahad

340-675-9876

[email protected]

22

 

673-980

Mohammad Ahmed

234-896-2567

[email protected]

28

 

129-678

Waad Saud

280-986-8736

[email protected]

31

a. What is the relational schema of the relation Contact_Info?  [0.25 Point]

 

b. What is the degree of the giving relation? [0.25 Point]

 

c. Is the column Name an atomic attribute/value? If no, justify your answer? [0.25 Point]

d. What are the outputs of the given operations?  

1.                      (Contact_Info)  [0.50 Point]

2.   (Contact_Info)   [0.25 Point]