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A Beginner’s Guide to SQL

A great guide for learning SQL from the start, from Udemy:

https://blog.udemy.com/beginners-guide-to-sql/

What Wikipedia has to say about UDemy:

Udemy.com is a platform or marketplace for online learning. Unlike academic MOOC programs driven by traditional collegiate coursework, Udemy provides a platform for experts of any kind to create courses which can be offered to the public, either at no charge or for a tuition fee.[1]Udemy provides tools which enable users to create a course, promote it and earn money from student tuition charges.

In addition to SQL You will find there also the following tutorials: