Whether you are looking to learn how to code or just looking for reference sites, here's a collection of online resources you can use for free online. From degree and certificate courses to reference sites, its never been easier to learn software development and this should make it even easier.
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sql.learncodethehardway.org
Learn SQL The Hard Way is a crash course in the basics of SQL to store, structure, and analyze data. It covers all the introductory commands and includes videos demonstrating every exercise. If you need to learn SQL quick, this is the book for you.