SQL, data & the careers
built on both.
Practical guides written by practitioners. No fluff, no generic advice. Just what actually works when you're learning with real data and real ambition.
Build an IMDb Movie Dashboard with SQL and Tableau (Free Beginner Project)
The perfect first SQL and data project: answer three questions with SQL on 250 top-rated films, then turn the results into a polished, shareable Tableau dashboard. No installs, about 45 minutes.
Build an IMDb Movie Dashboard with SQL and Tableau (Free Beginner Project)
The perfect first SQL and data project: answer three questions with SQL on 250 top-rated films, then turn the results into a polished, shareable Tableau dashboard. No installs, about 45 minutes.
SQL Practice Questions (With Answers, Easy to Hard)
Ten practice questions with worked solutions, from your first WHERE clause to window functions. Try each one before you reveal the answer, because that is where the learning actually happens.
The Best SQL Games and Learning Resources (2026)
Every SQL game and learning resource worth knowing in 2026. What each one teaches, where each one stops, and which to pick.
WHERE vs HAVING in SQL: The Difference, Explained
WHERE filters individual rows before they are grouped. HAVING filters the groups after. Toggle each filter below and watch rows drop, then whole groups drop.
SQL Order of Execution: How Queries Actually Run
You read a query from SELECT down. The database runs it in a completely different order, starting with FROM and reaching SELECT almost last. Press play and watch a real query run, stage by stage.
SQL CASE WHEN Explained (Simple vs Searched, ELSE & Pivots)
CASE WHEN is just if/else for SQL: it walks your conditions top to bottom and returns the first one that is true. Flip the conditions below and watch every row re-bucket.
Introducing the Career Hub: Practice SQL Interviews for Real
A new home for landing the data job: real company-style SQL interview questions, a rapid-fire quiz across the whole data stack, and a map of the roles you are aiming for.
SQL OVER Clause & Window Functions Explained (ROW_NUMBER, RANK)
Window functions look intimidating and are secretly simple: keep every row, and add one calculated column beside it. Switch between the functions below and watch the board change.
SQL JOINs Explained: A Visual, Interactive Guide
JOINs trip up nearly everyone learning SQL. Pick a JOIN type below and watch exactly which rows survive, drop, and combine, one row at a time.
How to Learn SQL Fast (Without Boring Yourself to Death)
The reason most people quit SQL tutorials isn't difficulty. It's that nothing they're querying matters to them. Here's a better way.
How to Prepare for a SQL Interview: What Actually Comes Up
Generic SQL prep misses the point entirely. Here's what hiring managers are really testing for, and why the company you're interviewing at should change how you prepare.
Stay in the loop
New posts. No spam.
Get notified when new SQL guides, career posts, and data deep-dives are published. One email per post, nothing else.