The best book that helped me was without a doubt SQL: A Beginner's Guide . It was one of the most boring books I read (very simple), but I learned a lot. A very, very useful book, I would not learn SQL with this. The bonus is that it teaches you SQL, not MySQL, not T-SQL, not PostgreSQL, not SQL Server: just plain SQL. It highlights the nuances where necessary, but otherwise it's just SQL.
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