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2 Marks
Learning Outcome(s):
Design a database starting from the conceptual design to the implementation of database schemas.
Question One
Explore the concept of domains in SQL databases and their significance in enforcing data integrity constraints. Describe the steps involved in creating and utilizing domain constraints using the CHECK clause. Provide real-world examples where domain constraints are essential for ensuring the validity and consistency of data. Additionally, discuss the benefits and limitations of using domains compared to traditional CHECK constraints.
3 Marks
Learning Outcome(s):
Create Entity-Relationship model, Relational model, and write SQL queries.
Question Two
The following is a Student Table from a database. Write your SQL queries to answer the following questions:
Student_ID
Name
Age
Gender
Grade
1
Sarah
18
Female
90
2
Mohamed
19
Male
85
3
Ahmed
17
Male
77
4
Maryam
18
Female
92
5
Saeed
20
Male
87
Retrieve the Name and Age of students with a Grade greater than 89.
Retrieve the count of Male students in the student table.
Retrieve the average Grade of all students.
Update the Grade of the student with Student_ID 3 to 90.
Delete the record of the student named “Ahmed”.
Insert a new student into the table.
3 Marks
Learning
Outcome(s):
Design a database starting from
the conceptual design to the implementation of database schemas
Question Three
Consider a database schema with
the following tables:
CREATE
TABLE Students (
StudentID INT PRIMARY KEY,
Name VARCHAR(50),
Age INT,
GPA FLOAT );
CREATE
TABLE Courses (
CourseID INT PRIMARY KEY,
CourseName VARCHAR(50) );
CREATE
TABLE Enrollments (
EnrollmentID INT PRIMARY KEY,
StudentID INT,
CourseID INT,
Grade FLOAT,
FOREIGN KEY (StudentID) REFERENCES
Students(StudentID),
FOREIGN KEY (CourseID) REFERENCES
Courses(CourseID));
Solve the following SQL
problems by nesting queries.
1. Write an SQL query to find the names of students
who are enrolled in the course ‘Mathematics’ and have a GPA greater than 3.5.
2. Assuming the same database schema, write an SQL
query to find the average GPA of students who have enrolled in the course
‘Physics’.
Extend the previous query to find the average GPA of students who have
enrolled in the course ‘Physics’ and whose age is less than 25.
please make sure for the awnsers and add references please
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