SQLBeginner
Intro to SQL: Querying and Managing Data
Khan Academy's interactive SQL course. Learn to create tables, insert data, query with SELECT, filter with WHERE, join tables, and aggregate with GROUP BY.
Free course on freeCodeCamp
Relational Database (freeCodeCamp)
60 hours 4.7(5,200 reviews)Free
freeCodeCamp's Relational Database certification teaches SQL, database design, and how to build and query relational databases using PostgreSQL. You learn through five projects where you build a quiz game database, a universe database, and other schema design problems. The entire course is free with no paywall. After finishing, you understand how to design tables, write queries, and work with real databases on your local machine. The main limitation: this assumes you already know basic SQL. If you're new to SQL, start with Khan Academy's free SQL intro or CS50's SQL course first.
PostgreSQL is used by 58.2% of professional developers, the highest of any database in the survey, and it's the exact database this course's five projects run on (source: Stack Overflow Developer Survey 2025, Databases section, survey.stackoverflow.co/2025/technology).
About This Course
Learn SQL, PostgreSQL, and relational database concepts by completing projects in a Linux environment. Covers table design, joins, constraints, and database management. Free verified certificate.
Course Details
- Platform
- freeCodeCamp
- Language
- SQL
- Level
- intermediate
- Duration
- 60h
- Certificate
- Yes, included
- Cost
- Free
Frequently Asked Questions
Is freeCodeCamp's Relational Database course free?
Yes, completely free. No subscription, no paywall, and the certificate is free.
Do I need to know SQL first?
Some SQL experience helps. The course teaches practical SQL, but assumes you know basic SELECT and WHERE. If you're new, start with Khan Academy's free SQL course.
What database system does it use?
PostgreSQL, an industry-standard open-source relational database. The SQL concepts transfer to MySQL, SQLite, and other databases.
Will I learn to design databases?
Yes. The projects focus on schema design: choosing tables, columns, and relationships. That's core database architecture.
What's the next step after this?
Pair it with a backend framework like Node.js, Django, or Rails to use your database in a real application. Or learn data analysis (pandas, R) to work with databases.
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