SkillScore
How sharp is your PostgreSQL?
Three-valued logic, MVCC and the planner: the behavior that decides whether your query is correct or just lucky.
Checking your PostgreSQL standing
Snippet0:42
Some orders have region IS NULL. Are those rows counted?
SELECT count(*)
FROM orders
WHERE region <> 'EU';A taste of the format. The real bank adapts to your rating.
The ladder
Eight titles. One honest number.
Every full assessment lands you on one of eight rungs. Here is the whole climb, and what actually moves the number.
1
Only full assessments move it.
Gap re-checks never touch the rating, so the number is always earned.
2
Every answer adjusts the difficulty.
Beat questions above your level and the rating climbs fast, Elo style.
3
One attempt per 14 days.
Ratings stay honest because you cannot grind them daily.
- Grandmaster1900+
- Master1750+
- Expert1600+
- Advanced1450+
- Proficient1300+
- Practitioner1150+
- Learner1000+
- Noviceunder 1000
Your PostgreSQL rating is 20 questions away.
Free with any account. One attempt per 14 days, so bring your best.