Share 'Free Book: SQL Essentials'
Update on 5/20/2019: it is no longer a free book, now available on Amazon, here. This book is a guide to using SQL to retrieve data from databases. This site includes a 'Practice SQL' environment where you can try out the examples from the book and experiment with SQL queries. This book is available here. Contents 1. Prerequisites..............4 2. Instructions................4 3. Joining tab…
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