SQL Noir
Solve cases with SELECT, joins, and windows.
Data Platform & Analytics
Data Scientist
Answer business questions with SQL: filter, join, find trends, and measure funnels.
- Pull the right rows from messy company tables
- Join tables and explain who did what
- Build funnels and retention numbers product teams trust
New here? Skill 1 starts with SELECT — pick columns from a table.
Python, statistics, and model training are not games on this path yet.
Brush up first
Optional Learn to code tutorials. Skip any you already know, then start Skill 1.
Your path to Data Science
Finish them in order. Each step unlocks after you clear the one before it.
Step 2: Summarize a dataset
Count, group, and filter piles with GROUP BY and HAVING.
About 2 hours
Locked
Step 3: Combine datasets
Join tables and use subqueries to follow a story across data.
About 3 hours
Locked
Step 4: Find trends
Use window functions and CTEs to spot trends over time.
About 3 hours
Locked
Step 5: Answer product questions
Build funnels, retention, and warehouse-scale SQL on a budget.
About 3 hours
Locked
Practice more
Free practice hubs — jump in whenever you want reps outside the skill order.
