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Learn SQL by writing it. Not by watching it.

Every exercise runs against a real business database — employees, orders, customers. You type a query, see the real result, and learn the pattern. From SELECT to window functions, in the order interviews actually test.

SELECT * FROM ordersWHERE status = 'paid';↳ 7 rows returnedID AMOUNT STATUS01 $1,200 paid02 $2,500 paidsame pattern,over and over

Lessons

Free to start — the first three lessons are open. The interview-critical material unlocks with one payment, forever.

SELECT & WHERE
Pull specific columns and filter rows. The same two clauses you'll write in ~every query of your career.
free
ORDER BY, LIMIT, DISTINCT
Control the shape of your result: sort it, cap it, and de-duplicate it.
free
GROUP BY & Aggregates
Summarize rows — count, sum, average. The heart of analyst work.
free
JOINs
Combine tables. This is where most beginners stall — and what interviews hammer hardest.
7 exercises
Window Functions
Rank, number, and take running totals without collapsing rows. The skill that 'gets people hired'.
6 exercises
Subqueries & CTEs
Break a big question into readable steps with a WITH block.
6 exercises
Interview Patterns
The recurring families real interviews reuse: latest-per-group, better-than-average, top spenders.
3 exercises

Pricing

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  • First three lessons, full exercises
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Full course

$12one-time, lifetime
LessonsAll seven
JOINs · windows · CTEsIncluded
SolutionsIncluded
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Pay once. Yours forever. No subscription.

One payment, yours forever. No subscription. Pay once, unlock all practice and solutions.