In today’s digital world, students are not only users of technology but also future creators.
Computer Science is no longer just about understanding machines; it is about learning how to
design, build, and improve solutions that help people in their daily lives. For junior high school
students, this is the right time to start exploring how the applications they use every day—
websites, mobile apps, and online systems—are actually created.
This book, “Computer Science for Junior High School – Grade 3: Building a Student Portal
with PHP and MySQL”, is designed to provide a practical and hands-on learning experience.
Rather than focusing only on abstract theory, students will learn programming from a
developer’s perspective. Step by step, they will build a real-world application: a student portal
where users can log in, view schedules, access materials, check exam results, and even practice
with online exercises.
The book uses PHP and MySQL as the main tools. PHP is one of the most widely used server
side scripting languages in web development, while MySQL is a powerful database system to
store and manage information. Together, they form a solid foundation for learning how web
applications work.
The chapters are structured to start with the fundamentals—what a program is, how web
applications function, and why databases are important—and gradually move toward building a
complete project. Each chapter includes explanations, examples, coding exercises, and summary
sections that reinforce learning.
By the end of the book, students will not only have learned the basics of programming and
databases but will also have developed a fully functional student portal application. This will
help them see the connection between what they study in class and real-world systems they
interact with every day.
It is my hope that this book will inspire students to explore computer science further, to become
not just technology consumers but also technology creators. With practice and curiosity, they can
continue to build more advanced projects and perhaps one day design systems that will be used
by many people.
Happy learning and coding!
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