SQL for Business Analysis
Transform transactional records into strategic business insights using advanced SQL. Master window functions, complex data reshaping, funnel and cohort analyses, and query tuning for reliable commercial reporting.
Like Duolingo, but for SQL for Business Analysis. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
24 levels across 4 sections, about 48 minutes end to end, roughly 10 days at five minutes a day. It moves through Unlocking Dynamic Metrics with Window Functions, Structuring and Reshaping Complex Business Data, Standard Commercial Analytical Models, and Query Tuning and Metric Integrity. It assumes you already know the basics.
Free forever · No credit card · iPhone & Android
Key ideas in SQL for Business Analysis
- A standard GROUP BY collapses rows down to one record per unique grouping key.
- An OVER clause computes aggregates across a partition while retaining every underlying row.
- Grouping by individual row keys prevents calculating multi-row partition averages.
- Adding ORDER BY inside an OVER clause defaults the frame to start from the beginning up to the current row.
- An ordered window computes cumulative totals without expensive recursive CTEs or self-joins.
- Omitting ORDER BY from an OVER clause evaluates the sum across the entire dataset at once.
- ROWS counts an exact physical quantity of preceding or following table rows.
- RANGE evaluates offsets based on logical values like calendar date intervals.
- Missing dates cause ROWS to stretch across weeks while RANGE respects temporal gaps.
- A rolling moving-window aggregate dampens short-term daily volatility and weekend anomalies.
- Spreading daily sales across multi-day windows isolates meaningful business momentum.
- Window aggregates compute moving metrics on the fly without modifying underlying data rows.
- PARTITION BY splits calculation boundaries so running totals reset for each segment.
- ORDER BY dictates the sequence in which rows accumulate within each partition boundary.
- The SQL engine evaluates separate partition windows in a single scan without extra passes.
- LAG retrieves values from earlier rows without joining a table back to itself
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives SQL for Business Analysis the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
You want to show each employee's salary alongside their department's average salary. What SQL clause lets you keep every individual row while calculating that group average?
Get it right to open this lesson and 23 more in the app.
Where SQL for Business Analysis takes you
- 1
Unlocking Dynamic Metrics with Window Functions
- Running Calculations and Moving Windows
- Comparative Ranking and Period-Over-Period Shifts
- 2
Structuring and Reshaping Complex Business Data
- Multi-Step Pipelines with Common Table Expressions
- Pivoting and Summarizing Dimensional Metrics
- 3
Standard Commercial Analytical Models
- Funnel and Conversion Drop-Off Analysis
- Cohort Definition and Retention Analysis
- 4
Query Tuning and Metric Integrity
- Execution Plans and Performance Optimization
- Preventing Metric Distortion and Edge-Case Errors
4 sections · 8 units · 24 levels. Built to play, not to enroll.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
SQL for Business Analysis is taught in the Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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