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W3schools SQL Tutorial

SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems.

This website is useful when I wanted to learn SQL function one by one. For example, in the sidebar, we can click a specific function to learn. It also provides a console and Q&A section to test our knowledge.
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