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Databse assignment help Sample by VAH Experts
How is the Linux operating system used?
Each version of the Linux OS manages hardware resources, launches and handles applications, and provides some form of the user interface. The large community for developers and the wide range of distributions means that there is a Linux version available for almost any task, and Linux has penetrated many areas of computing.
Databse assignment help Sample by VAH Experts
What is the purpose of database normalization?
Normalization is the process of organizing data in a database. The database must be normalized to reduce redundancy (duplicate data) and ensure that only related data is stored in each table. It also prevents any problems from database modifications such as insertions, deletions, and updates. The stages of the organization are called general forms.
Databse assignment help Sample by VAH Experts
You are tasked with designing a relational database for a university management system. The database should store information about students, courses, and instructors. Identify at least three tables needed for this database and define their attributes. Explain the concept of Primary Key and Foreign Key with respect to your database design. Write an SQL query to retrieve the names of all students enrolled in a specific course.
1. Tables and Attributes:
For a university management system, the following tables can be created:
-
Students Table
- Student_ID (Primary Key)
- Name
- Phone
-
Courses Table
- Course_ID (Primary Key)
- Course_Name
- Credits
-
Enrollments Table (Handles many-to-many relationships)
- Enrollment_ID (Primary Key)
- Student_ID (Foreign Key referencing Students)
- Course_ID (Foreign Key referencing Courses)
- Enrollment_Date
2. Primary Key vs. Foreign Key:
- Primary Key: A primary key is a unique identifier for each record in a table. For example,
Student_IDin the Students table is a primary key because it uniquely identifies each student. - Foreign Key: A foreign key is an attribute in one table that refers to the primary key in another table. For example,
Student_IDin the Enrollments table is a foreign key that links to the Students table, ensuring referential integrity.
3. SQL Query to Retrieve Students Enrolled in a Specific Course:
SQL
CopyEdit
SELECT Students.Name FROM Students JOIN Enrollments ON Students.Student_ID = Enrollments.Student_ID JOIN Courses ON Enrollments.Course_ID = Courses.Course_ID WHERE Courses.Course_Name = 'Database Management Systems';
This query retrieves the names of all students who are enrolled in the "Database Management Systems" course.
