8 Best Free SQL Courses for Data Analysts in 2026
Best free SQL courses for data analysts in 2026, ranked by what is truly free and what earns a certificate: freeCodeCamp, Kaggle, Mode, SQLZoo, SQLBolt.
The best free SQL course for data analysts in 2026 is freeCodeCamp's Relational Database certification: it is free from start to finish, awards a free certification when you finish the projects, and teaches SQL and PostgreSQL on tasks that resemble real analyst work. The strongest companions are Kaggle's Intro to SQL for fast, hands-on repetition against live datasets and Mode's SQL Tutorial for the analytics-flavored queries you write on the job every day. Below is the full ranked list of eight, with a clear note on what "free" means for each, because some of these are free end-to-end with a certificate and some give you the lessons but charge for the credential.
SQL is the one language nearly every data analyst job assumes you know. It appears in roughly half to three-quarters of data analyst job postings, more than any other skill and well ahead of Python, which appears in 31% to 42% of postings (OneHour Digital; Statssy). The good news for a career changer is that the SQL that gets you hired is learnable for free, and faster than most people expect. If you want the broader map of every free skill an analyst needs, SQL, spreadsheets, a BI tool, statistics, plus Python, our complete free data analytics resource guide is the pillar this list supports. This article narrows in on the SQL piece.
How these courses are rankedPermalink to “How these courses are ranked”
Three criteria, in order of weight:
- Actually free. Free end-to-end ranks above "free to audit," which ranks above a free trial. The table states the real cost of each.
- Teaches analyst SQL, not just syntax. A course covering JOINs, GROUP BY, and window functions ranks above one that stops at SELECT and WHERE, because aggregation and joins are what an analyst writes daily.
- Hands-on with a path. Courses that end in a project or certificate rank above passive video playlists, because finished work is what gets you hired.
The 8 best free SQL courses for data analystsPermalink to “The 8 best free SQL courses for data analysts”
| # | Course | Truly free? | Certificate | Best for |
|---|---|---|---|---|
| 1 | freeCodeCamp: Relational Database | Yes, end-to-end | Yes, free certification | Project-based SQL and PostgreSQL |
| 2 | Kaggle Learn: Intro to SQL | Yes, end-to-end | Yes, free | Fast reps on real BigQuery datasets |
| 3 | Mode: SQL Tutorial | Yes | No | Analytics queries: JOINs, window functions |
| 4 | SQLBolt | Yes | No | First hour, first query in minutes |
| 5 | SQLZoo | Yes | No | Progressive practice and reference |
| 6 | HackerRank: SQL | Yes | No | Interview-style practice |
| 7 | Coursera: SQL for Data Science (UC Davis) | "Full Course, No Certificate" | Paid (financial aid available) | Structured, academic track |
| 8 | Harvard CS50: Introduction to Databases with SQL | Yes, end-to-end | Yes, free | University-rigor fundamentals |
1. freeCodeCamp: Relational Database (top pick)Permalink to “1. freeCodeCamp: Relational Database (top pick)”
If you do only one course on this list, do this one. It is completely free and grants a free certification once you finish the certification projects, which include building a database of celestial bodies, a world database, and a periodic-table database, all in PostgreSQL. It pairs raw SQL with the surrounding skills an analyst actually touches: the bash terminal, psql, and the basics of designing a schema. The project-based structure means you finish with artifacts you can show, not just watched videos. It is the closest thing to a free, end-to-end SQL and databases bootcamp.
2. Kaggle Learn: Intro to SQLPermalink to “2. Kaggle Learn: Intro to SQL”
Kaggle's free SQL module is the best complement to freeCodeCamp: short, focused lessons you run in the browser with no setup, against real data in Google BigQuery. You write queries against a live database rather than a toy table, and Kaggle issues a free completion certificate when you finish. Use it to practice one specific skill in an afternoon, then return to a longer course for structure.
3. Mode: SQL TutorialPermalink to “3. Mode: SQL Tutorial”
Mode's tutorial is the analytics-flavored pick. Free and self-paced, it walks through the SQL an analyst uses day to day, with real emphasis on the parts that trip people up: JOINs, GROUP BY, and window functions. You write queries in an in-browser editor against sample data, and the lessons are organized the way an analyst thinks, starting from retrieval and moving into the reporting queries that answer business questions. There is no certificate, but the practice is exactly the kind that shows up in take-home assignments.
4. SQLBoltPermalink to “4. SQLBolt”
SQLBolt is the best first hour you can spend. Free, interactive, and entirely in the browser, it has you writing real SELECT statements within minutes, then builds through filtering, joins, and aggregation one short lesson at a time. There is no certificate and no video, which is the point: the fastest way past the fear of SQL is to type a query and see it run. Start here on day one, then graduate to freeCodeCamp or Mode for depth.
5. SQLZooPermalink to “5. SQLZoo”
SQLZoo is the workhorse practice-and-reference site. Free and browser-based, it offers progressive exercises from basic SELECT through nested subqueries and window functions, with a reference section that doubles as a lookup when you forget a clause. It does not grant a certificate, but it is one of the most reliable places to drill a specific concept until it sticks. Keep it open in a tab alongside a structured course.
6. HackerRank: SQLPermalink to “6. HackerRank: SQL”
HackerRank's SQL domain is where you turn practice into interview readiness. Free and browser-based, it offers ranked SQL problems from easy to hard, the kind hiring managers use in screening, with instant feedback on your queries. There is no certificate, but finishing a stretch of medium and hard problems is concrete proof you can write SQL under pressure. Use it after you have the basics from SQLBolt or Mode.
7. Coursera: SQL for Data Science (UC Davis)Permalink to “7. Coursera: SQL for Data Science (UC Davis)”
The UC Davis course is the structured, academic option. It is free via Coursera's "Full Course, No Certificate" route: you get every lesson and assignment, and the certificate is paid unless financial aid covers it. It is part of the Learn SQL Basics for Data Science Specialization and leans into applying SQL to analysis problems, with a final project where you frame and answer questions from a real dataset. It suits learners who want a syllabus, deadlines, and a graded project to stay accountable.
8. Harvard CS50: Introduction to Databases with SQLPermalink to “8. Harvard CS50: Introduction to Databases with SQL”
CS50 SQL is the rigorous-fundamentals pick. Taught as part of Harvard's CS50 family and available completely free, with a free certificate through CS50's own site, it covers database design, data types, constraints, indexes, and optimization across roughly seven weeks, with problem sets graded automatically. It is more than most analyst roles require, which is exactly why it is valuable: the foundations it builds keep you from getting stuck when a slow query or a tricky schema shows up at work.
What a SQL for data analytics course should coverPermalink to “What a SQL for data analytics course should cover”
A complete analyst SQL path teaches four layers, in roughly this order: retrieving and filtering rows with SELECT and WHERE, combining tables with JOINs, summarizing with GROUP BY and aggregates, and answering ranked or running-total questions with window functions and CTEs. A course that stops at the first two layers leaves you unable to do the reporting work analysts are hired for, because the interesting questions almost always span more than one table.
Use that standard to compare the top picks by depth and format:
| Course | Depth | Prereq | Certificate | Format |
|---|---|---|---|---|
| freeCodeCamp | SELECT through design, PostgreSQL projects | None | Free | Interactive + terminal |
| Kaggle Learn | SELECT, JOIN, GROUP BY on real data | None | Free | Interactive notebooks |
| Mode | JOINs, GROUP BY, window functions | None | No | Interactive tutorial |
| CS50 SQL | Design, indexes, optimization | None | Free | Video + problem sets |
| Coursera UC Davis | Applied analysis, final project | None | Paid (financial aid) | Video + labs |
| SQLBolt / SQLZoo / HackerRank | Practice layers, no design | None | No | Interactive practice |
The comparison makes the choice clearer. freeCodeCamp is the only free option that takes you from your first query to a designed database with a certificate; Kaggle and Mode cover the analyst core but stop short of database design. CS50 SQL goes deeper than an analyst strictly needs, while the three practice sites are tools to drill specific layers, not full courses on their own.
Which free SQL course should you take?Permalink to “Which free SQL course should you take?”
If you came looking for one free SQL course rather than the full list, the choice comes down to where you are starting:
| If you want… | Take this | Why it fits |
|---|---|---|
| A free, project-based SQL course with a certificate | freeCodeCamp: Relational Database | PostgreSQL projects, a free certification, and end-to-end coverage |
| Quick interactive practice on real datasets | Kaggle Learn: Intro to SQL | Free, no setup, queries against live BigQuery data |
| The analytics queries you write at work | Mode: SQL Tutorial | Free, focused on JOINs, GROUP BY, and window functions |
Start with freeCodeCamp if you want a single path you can finish, use Kaggle for fast reps whenever a concept feels shaky, and keep Mode bookmarked for the reporting patterns that show up in take-homes.
How to combine them into one free pathPermalink to “How to combine them into one free path”
No single course takes you all the way. The efficient free sequence is:
- First contact (week 1): SQLBolt, one or two short lessons a day, until SELECT, WHERE, and JOIN feel automatic.
- Analyst core (weeks 2 to 6): freeCodeCamp's Relational Database certification for depth and a project, with Kaggle's Intro to SQL for same-day practice on real data.
- Reporting and interview readiness (weeks 7 to 10): Mode for window functions and CTEs, HackerRank and SQLZoo to drill speed.
This mirrors the broader free path in our complete resource guide. If you are still weighing which language to learn first for a data role, our SQL vs Python comparison breaks down the tradeoff; most working analysts need both, and SQL pairs naturally with the step-by-step SQL learning plan and, later, free Python courses for data analysis. If your goal is a data analyst role rather than SQL fluency alone, the full guide to becoming a data analyst without a degree shows where SQL sits beside spreadsheets, a BI tool, and Python.
How Traecta helpsPermalink to “How Traecta helps”
When I moved from sysadmin work into data analysis, SQL was the skill that paid off fastest: the first query I ran against admission logs in a health-tech project answered a question no spreadsheet could. That is the bet this list is built around, because SQL gives a career changer the quickest credible win in data. Traecta — Your Personalized Career Roadmap places your SQL practice in the exact week your plan needs it, right after spreadsheets and before your first BI dashboard, and ties each query you write to a portfolio dataset, so the time you spend practicing doubles as the proof you show employers.
The certificate realityPermalink to “The certificate reality”
A common trap is to chase a paid certificate hoping it will get you hired. It rarely does. As of 2024, about 73% of employers used skills-based hiring (SHRM), so demonstrated skill matters more than the credential. A public GitHub repo of well-written queries, or a Kaggle notebook answering a real question, beats a stack of certificates every time. For the full case on where to invest, see our certificates vs. portfolio guide for career changers.
The practical takeaway: prefer the courses that are free and build a project, and treat any paid certificate as optional.
Common mistakesPermalink to “Common mistakes”
- Collecting courses instead of finishing them. Starting five free SQL sites and finishing none teaches nothing. Pick one, finish the core, then practice.
- Stopping before JOINs. SELECT and WHERE alone do not make you useful for analysis. JOINs and GROUP BY are where analyst SQL actually starts.
- Practicing on toy tables only. Clean one-row sample data hides the messiness of real schemas. Run queries against real datasets early, through Kaggle or Mode.
- Never publishing your queries. If your work lives only on your laptop, employers cannot see it. Push notebooks to GitHub or Kaggle as you go.
The takeawayPermalink to “The takeaway”
The best free SQL course is the one you finish, and freeCodeCamp's Relational Database certification is the strongest choice because it is free end-to-end, earns a free certification, and ends in projects you can show. SQL also ages well as AI tools take over routine work; will AI replace data analysts covers where the role is heading. Round it out with Kaggle for real-data reps, Mode for analytics queries, and CS50 SQL if you want the deeper foundations. Whatever you pick, finish it and turn it into something public, because that is what moves you toward a data role. Slotting SQL into your Traecta career roadmap means the right course lands in the right week, next to the spreadsheets, statistics, and portfolio steps that surround it, so the free hours you put in compound into a job-ready path instead of a half-finished library of bookmarks.
SourcesPermalink to “Sources”
- OneHour Digital. Data Analyst Career Statistics (SQL in ~52.9% of postings; Python ~31.2%). OneHour Digital
- Statssy. How much SQL should a data analyst know? (SQL in ~73% of postings). Statssy
- freeCodeCamp. Relational Database Certification. freeCodeCamp
- Kaggle. Intro to SQL (Kaggle Learn). Kaggle
- Mode. SQL Tutorial. Mode
- Harvard University. CS50's Introduction to Databases with SQL. CS50
- Coursera. SQL for Data Science (UC Davis). Coursera
- SHRM (2024). Skills-based hiring. SHRM
