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geeksforgeeks.org
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GeeksforGeeks is a computer science education site offering extensive tutorials, articles, and practice problems on programming, data structures and algorithms, plus SQL. It covers SQL basics to advanced topics with example queries, code snippets, and interview-focused content.
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sqlzoo.net
SQLZoo is an interactive SQL tutorial that lets you practice writing queries against built-in sample databases. It offers guided lessons, a wide range of practice problems, and instant feedback with live query results.
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datacamp.com
DataCamp is an online data science learning platform offering interactive SQL, Python, and R courses with hands-on coding challenges and real-world projects.