Tutorials

Seaquel includes a built-in SQL curriculum that teaches you from the basics through advanced topics. Every lesson runs against a practice database — no external setup needed.

Accessing tutorials

1. Open the sidebar and select SQL Sandbox.
2. Or press Cmd+K (Mac) / Ctrl+K (Windows/Linux) and search for “SQL Sandbox”.

Curriculum

The tutorials cover these topics in order:

1. Introduction to SQL — what databases are, basic terminology
2. SELECT statements — retrieving data from tables
3. WHERE clauses — filtering rows with conditions
4. JOINs — combining data from multiple tables (INNER, LEFT, RIGHT, FULL)
5. GROUP BY and aggregates — COUNT, SUM, AVG, MIN, MAX
6. HAVING clauses — filtering grouped results
7. ORDER BY — sorting output
8. Subqueries — nesting queries inside queries
9. Window functions — ROW_NUMBER, RANK, running totals
10. Common Table Expressions — writing readable queries with CTEs

How lessons work

Each lesson introduces a concept with a brief explanation, then presents progressive challenges. You write SQL in the editor, and Seaquel validates your queries in real time using SQL AST parsing — it checks the structure of your query, not just the output.

Challenges build on each other within a lesson. Complete one to unlock the next.

Progress

Your progress is saved automatically. Pick up where you left off any time.