There are several online platforms where you can practice SQL commands:
SQLZOO: This website provides interactive tutorials and exercises for SQL learners of all levels.
Codecademy: Codecademy offers a free interactive SQL course that covers the basics of SQL syntax and querying databases.
W3Schools: W3Schools is a popular web development resource that offers a free online SQL tutorial with interactive examples and quizzes.
HackerRank: HackerRank is a coding challenge website that offers a variety of SQL challenges and exercises to help you improve your SQL skills.
LeetCode: LeetCode is another coding challenge website that offers SQL problems and challenges for users to practice their SQL skills.
Kaggle: Kaggle is a platform for data science competitions and offers a variety of SQL challenges and datasets for users to practice SQL skills.
SQL Fiddle: SQL Fiddle is a web-based SQL playground that allows you to experiment with different SQL commands and test queries against different databases.
DB-Fiddle: DB-Fiddle is another web-based SQL playground that supports multiple databases including MySQL, PostgreSQL, SQLite, and SQL Server
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