Free online courseSQL Database Programming

Course Description

Learning to work with data starts with knowing how databases are structured and how to ask the right questions of them. In this free online course on SQL database programming, you will develop the practical skills needed to create, manage, and query relational databases with confidence. You will move from understanding what databases and DBMS/RDBMS systems do in real organizations to writing SQL that turns raw records into useful, trustworthy information.

The course guides you through the core building blocks of relational design: tables, keys, and relationships. You will see why primary keys matter, when surrogate keys are used, and how foreign keys connect business entities across a schema. Along the way, you will practice writing commands that create and remove tables, insert data, update existing records, and safely delete rows based on conditions. This foundation helps you avoid common mistakes that lead to duplicated, inconsistent, or hard-to-maintain data.

As your SQL grows, you will learn to write clear, efficient queries to filter, sort, and limit results, and to return exactly what a report or application needs. You will also work with patterns using wildcards, combine results using UNION, and connect information from multiple tables with joins. These are the everyday tools behind analytics dashboards, internal tools, and application features that rely on accurate data retrieval.

Beyond querying, you will explore more advanced database behavior and design thinking. You will understand why nested queries are used, how constraints enforce data quality, what triggers can automate responses to changes, and what happens when foreign key rules like ON DELETE CASCADE are applied. The course also introduces ER diagrams and shows how to translate a design into a working schema, including handling one-to-one relationships and participation rules. By the end, you will be ready to build a small company-style database, reason about relationships, and write SQL that supports reliable, real-world use.