Think in Systems, Not Trivia

Learn to Think in SQL, Not Just Code It.

SQL is the backbone of modern data & AI stacks — used by 59% of developers in 20251 and powering the most-used databases like PostgreSQL (49%)2. Clean, well-modeled data still decides whether AI delivers value, which is why structured SQL skills remain career-critical as data roles surge ~34%.3

Real Slack moment

Your VP just pinged you at 07:47 AM: “How many customers are on Cloud or Hybrid right now?”
You have 4 live tables. In 3 minutes, you write the query, run it, and send an AI-powered exec summary — no panic, no guesswork.

That’s what GroupBySQL trains you for — real data, real urgency, real impact.

Train yourself to train AI — because the best models learn from the best data.

Train in the SQL Dojo See full brief
1 Stack Overflow Developer Survey 2025 — SQL usage 59%.
2 Stack Overflow Developer Survey 2024 — PostgreSQL 49% most-used DB.
3 U.S. Bureau of Labor Statistics — Data scientist roles projected +34% (2024–2034).

Real Prompts

Manager-style questions tied to metrics like retention, pricing, churn, and cost. Work that mirrors reality.

Step-by-Step Framework

Think → Query → Validate → Communicate. Fast feedback sharpens reasoning, not recall.

Reusable Patterns

Mental models for work—from cohort logic to revenue gaps.

Why I built GroupBySQL

Most SQL resources teach you to pass tests. Real jobs demand clear thinking with messy data and executive outcomes. GroupBySQL trains analysts to think in systems, translate insights, and ship results — with fewer, better challenges.