What this will be:
- Scenario-based SQL practice (multi-step tasks, realistic schemas).
- Answer checks that go beyond “passes/leaks” — focus on correctness & habits.
- Clear explanations of why solutions work (NOT EXISTS vs LEFT JOIN, sargable time windows, etc.).
Today’s goal: get the site live on
groupbysql.com via GitHub Pages.
If you’re seeing this, DNS/HTTPS may still be propagating.