Practice assessment
SQL cleaning check
Casting, window functions, validation order and DuckDB behaviour.
- 8 multiple-choice questions, 10 minutes. The timer starts when you press Start and is kept on the server, so reloading resumes the same attempt.
- Allowed resources: anything you like. This is practice; there is no proctoring, and no AI tutor runs on this page.
- Results, the best answers and explanations are shown after you submit. A submission after the time limit is recorded as late.
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