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There's no better way to learn SQL than to take quizzes or practice.
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Listed below are some of my best articles SQL problems and puzzle articles. Each one is poses a challenging question, and the lays my answers for you to understand.
Recommended SQL Puzzles
These SQL puzzles and problems are based on Microsoft SQL Server Management Studio and the sample databases AdventureWorks and WideWorldImporters. You can get started using these free tools using my guide Getting Started Using SQL Server