Intro to SQL: Querying and Managing Data

Khan Academy's Intro to SQL teaches you to query databases with SQL (Structured Query Language), the standard language for data access. You learn SELECT, WHERE, filtering, sorting, joining tables, and aggregating data. All lessons are video-based with practice exercises in Khan's browser editor, so you don't need to install anything. After finishing, you can read from and analyze databases, a core skill for data work and backend development. The main limitation: this is a gentle introduction, not deep SQL. It covers querying, not database design or advanced topics like CTEs or window functions. Pair it with CS50's SQL course to get from querying through database design.

SQL remains one of the most in-demand skills in data science and backend development, ranking in the top 5 most-used languages (source: Stack Overflow Developer Survey 2025).