You must submit two separate copies (one Word file and one PDF file) using the A

You must submit two separate copies (one Word file and one PDF file) using the Assignment Template on Blackboard via the allocated folder. These files must not be in compressed format.
It is your responsibility to check and make sure that you have uploaded both the correct files.
Zero mark will be given if you try to bypass the SafeAssign (e.g. misspell words, remove spaces between words, hide characters, use different character sets, convert text into image or languages other than English or any kind of manipulation).
Email submission will not be accepted.
You are advised to make your work clear and well-presented. This includes filling your information on the cover page.
You must use this template, failing which will result in zero mark.
You MUST show all your work, and text must not be converted into an image, unless specified otherwise by the question.
Late submission will result in ZERO mark.
The work should be your own, copying from students or other resources will result in ZERO mark.
Use Times New Roman
font for all your answers
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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