data science / sql
SQL for Data Science, Free
Before the modeling comes the data — and most of it lives in a database. SQL is the one skill every data role assumes you have. Learn it interactively, for free, in your browser. All resources current.
SQL is the most under-rated data-science skill — every analyst and data scientist uses it daily to pull and shape data before any Python or R touches it. The best way to learn it is by doing, and these free interactive tutorials let you write real queries in the browser with instant feedback. Do them in order and you'll be query-fluent fast.
LEARN BY DOING
Interactive SQL tutorials
Write real queries in your browser — no setup required.
- SQLBolt ↗Free, interactive, in-browser SQL lessons that build from your first SELECT to joins and subqueries. The best place to start.sqlbolt.com
- Mode SQL Tutorial ↗A free, thorough tutorial aimed squarely at data analysis — basic, intermediate, and advanced SQL with a live query editor.mode.com
- Kaggle Learn: Intro to SQL ↗A free, hands-on micro-course that teaches SQL on real big-data tables (BigQuery), with a completion certificate.kaggle.com