Learn SQL from zero to job-ready. Inside an anime visual novel.
Three instructors teach, grade, and (if you let them) fall for you while you solve real warehouse queries, from your first SELECT to the messy production data tutorials skip. Runs in your browser. No install, no account.
How it works: write SQL, get reviewed
No videos, no multiple choice. You type a real query, a real database runs it right in your browser, and your instructor tells you exactly what went wrong. Like this:
SELECT id, user_id, total FROM orders WHERE status = 'SUCCESS';
The data lies. We teach you to read it anyway.
The idiosyncrasies real warehouses actually have, that no clean tutorial ever shows you.
Prices stored as strings
"1.0E-8", "0.000000", "", and one row that just says "N/A". You learn TRY_CAST and to drop the junk before it drops your query.
A boolean that lies
Four listing flags that disagree, and a status enum that is backwards on purpose. You learn to verify against the data, not the schema.
Dirty joins
UUID here, symbol there, chain-prefixed address over there. You learn the join-key landmines before they cost you a report.
14 modules, 187 problems
Foundations to window functions to growth analytics to a timed interview gauntlet. Graded client-side against real DuckDB.
Meet your instructors
They teach the rules, the rigor, and the part after the lesson ends.
Tsumugi
Pink twin-tails, zero patience, secretly rewrites your feedback so it stings less.
Aimi
The warm one. Stays after the lesson ends. Remembers everything. Everything.
Nora
Runs the Growth Desk. Measures you in metrics. Approves of your grain discipline.
Something is under the syllabus.
Most of the course is exactly what it looks like. Most of it.
14 modules. 187 problems. One table nobody talks about.
Be there when it opens.
One email, no spam. You get the demo link the day it goes live.