Free online courseDatabase Systems

Course Description

Turn raw information into well-structured, trustworthy systems by learning how modern databases really work. In this free online course, you will move from the fundamentals of data and database management systems to the practical thinking used to design, build, and operate databases that support real applications. Whether you want to strengthen your software development profile, prepare for technical interviews, or make better decisions as an analyst or product professional, database skills are a lasting advantage across the tech industry.

You will develop a clear mental model of how DBMS features go beyond spreadsheets and text files: roles and responsibilities, schema design, constraints, keys, and integrity rules that keep data consistent as systems grow. The course connects conceptual design with implementation, guiding you through relational modeling, ER diagrams, normalization choices, and the tradeoffs that shape performance and maintainability. You will also understand when relational databases are the best fit and when NoSQL approaches can be a smarter option depending on data structure, scale, and access patterns.

SQL is treated as a practical tool rather than a set of disconnected commands. You will gain confidence writing queries that filter, sort, join, group, and summarize data, while learning how NULL behavior can change results and how views can simplify access. From there, you will connect query writing to what happens behind the scenes: relational algebra concepts, query optimization, indexes, partitions, tablespaces, and storage structures that influence speed and cost. This knowledge helps you reason about performance instead of guessing.

Reliability is a major theme throughout the course. You will learn how transactions protect correctness, what ACID means in practice, how isolation levels and schedules affect concurrent users, and why locks, deadlocks, logging, backup, and recovery are essential in production. You will also explore database architecture with MySQL, plus cloud and distributed database concepts such as replication, CAP tradeoffs, and data warehousing foundations.

By the end, you will be able to speak the language of databases with confidence, design schemas with intention, and implement robust data solutions using SQL and widely used tooling. The included exercises reinforce key concepts so you can retain what you learn and apply it to real projects.