Build real SQL confidence in a weekend. Clear lessons, realistic queries, and interview-style practice you can reuse on the job.
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3 user_name,
4 COUNT(*) AS total_questions,
5 AVG(score) AS avg_score
6FROM user_submissions
7WHERE submitted_at > '2024-01-01'
8GROUP BY ALL
9ORDER BY total_questions DESC
10LIMIT 10;
Everything You Need To Master Modern SQL
- Foundations: Tables, filtering, joins, and aggregations explained clearly.
- Analytics SQL: Window functions, cohorting, and time-series patterns you see at work.
- Interview-Ready: Real prompts with guided solutions and clean explanations.
- Hands-On Practice: Solve, test, and refine queries in a real SQL editor.
- Keep Growing: New lessons and datasets added regularly.
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