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Learn with Atterna

Be sure of the number before you say it.

SQL is free: all 10 days of Start with a free account. You pay only for practice: case rounds (€19) and Meridian (€59).

Not sure which one?

Do you already answer work questions with data?

In a spreadsheet, a BI tool, Python, R or SQL — any of them counts.

The levels

Case rounds

Atterna Foundations

You can write a query and want to defend the number it gives

From case 2 · what you hand in

Case 2 · Who cut our commission?

Olga Petrova · finance“Somebody must have given sellers a discount on commission. Can you find out who?”

WeekTake rateElectronics
W3712.60%35.0%
W38 · promo11.46%47.7%

Decision memo

No reversal: the mix explains the drop.

Electronics, at 7% commission, went from 35% to 48% of GMV. Beside it: €21,516 of discounts the platform paid.

A sample learner’s call

€19one-timeearly-access price

Get Foundations

Try first, free: Case 1: Bigger baskets?

After it, you can

  • Find out what a number actually counts before you repeat it
  • Check a claim on the data: confirm it or break it
  • Defend the number in a case round

Inside · Two cases of about 27 minutes, three short drills and 41 practice tasks

  • Case 2Who cut our commission?
  • Case 3Refunds that don’t add up
  • Auto-checksEvery query is also run on a second dataset
  • Trap drillsCatch a wrong number in SQL, then say the right one
  • Practice41 SQL tasks with hints, in your cabinet; they open as you complete Start days
  • SandboxYour own queries on the marketplace data, saved

Includes Foundations

Atterna Analyst

You already answer work questions with data

From Meridian · an episode, then the case file

Episode 2 · The fast-delivery badge

Did the groups split fairly?

The numbers the decision rests on

Group splitplan 50 / 50you: 48.6%

Badge effect on conversionreport +17%fair part: +1.5 pp

Case file · 8 of 8 cases

“Eight cases together, eight months of work. Let’s go through what you decided and how it turned out.” — Vera Lind

  1. Record week
  2. The fast-delivery badge
  3. Who stays after the first purchase
  4. The seller who drags things down
  5. What one delivery costs
  6. A forecast for the sale
  7. The price of a discount
  8. Red Monday

€59one-timeearly-access price

Get Analyst

Try first, free: Meridian episode 1 with a free account

After it, you can

  • Take a messy question from a colleague to a decision
  • Check an A/B test, a cohort and a forecast before anyone acts on them
  • Write a memo the team can trace and act on

Inside · Eight episodes, about an hour each

  • MeridianEpisodes 1–8: an analyst’s working weeks in SQL, with ready-made Python notebooks
  • FoundationsCases 2–3, trap drills, Practice and Sandbox: everything in it is included

How paying works

  1. Pick a level, leave your emailNothing is charged here.
  2. A payment link within 24 hoursKirill, who builds Atterna, emails it. One-time €19 or €59, no subscription.
  3. Access on the same emailChanged your mind? Full refund within 14 days. Terms

Before you pay

I’m new to SQL. Should I pay now?

No. Start teaches SQL from zero, and all 10 days are free with an account. Come back when case 1 feels within reach.

Start day 1, free →
I know SQL already. What’s left?

Not syntax: each case asks what the number really counts and hides a plausible wrong one. Try case 1 free (17 min) and see if you catch it.

Case 1, free →
Will this help me get a job?

No course can promise that, and we don’t. You get practice on a practice company’s data and a portfolio of your queries and calls to talk an interviewer through.

See a sample portfolio →Practise 5 interview questions, free →
Can I start with Foundations and upgrade later?

Yes. Analyst includes everything in Foundations, so moving up costs only the €40 difference.

More questions

I work in Excel or Python. Is this for me?

Yes. The course teaches what to count and how to check it; SQL is the language we practise in, and we teach it from zero in Start, free with an account. What you learn about denominators, duplicated rows and periods carries straight back to your spreadsheet or notebook. The page “From Excel or BI to SQL” maps what you already do to the lessons.

How do I get a refund?

Write to hello@atterna.com or reply to your receipt within 14 days of paying: a full refund, no questions asked, even if you have already started.

Why are these early-access prices?

Atterna is new. Early learners get a lower price while the course grows; the price may go up later.

Who checks my work?

Every SQL answer is checked automatically, also on a second dataset, so a query that only works by accident is caught. Feedback on your reasoning is written into the course by us; wherever AI feedback is offered, it is optional and labelled.