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Martin Graber - Understanding SQL ( www.sql.ru/docs/sql/u_sql/ )
In my experience, this tutorial is ideal for learning. When I taught with the help of it, even the doubles could write complex queries for me.
Recently the book " SQL and Relational Theory. How to Write SQL Code Properly " has been published. In terms of theoretical training, IMHO one of the best.
O'Reilly Publishing. I advise you not to read online books, but to take a good book. At one time I figured out SQL using MySQL. Recipe collection
Forta Ben / Sams teach yourself SQL in 10 Minutes, 4th Edition
less than 300 pages
Read a couple of courses at INTUIT. True, they are there implicitly, but they gravitate towards ms sql.
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