SQL Tutorial

SQLZOO includes 13 tutorials on all the basics like WHERE, JOIN, SUM, and COUNT, 8 assessments, and other more resources. It’s disorganized and the presentation is unpolished, but the amount of content covering all of the basics is unparalleled. Try the lessons here first to learn the basics.

Learning SQL is a fantastic decision, it's the basis for pretty much all data analysis work. I'd suggest using sqlzoo.net - better than code academy, gets you hot to trot quick.

I went from zero knowledge to a Business Intelligence/SQL development internship by doing every exercise on sqlzoo.net.

Don't get me wrong, I loved sqlzoo's tutorial. But they only teach how to use queries.

SQLZoo is a nice free and interactive SQL tutorial developed and maintained by Edinburgh Napier University. The course features live interpreters and interactive exercises for multiple types of databases, such asMySQL, PostgreSQL, Oracle, SQL Server, and DB2. This site has three major sections: Tutorials, Assessments, and Reference. A tutorial is a set of exercises that aims to acquaint you with new topics. You start with SQL basics, then go through nested SELECT statements and aggregate functions (such as COUNT, SUM, or AVG), ending with more advanced JOIN operations. At any time, you can consult the Reference section for background on the appropriate theory, explained with interactive examples. After completing each tutorial, you can take a quiz to show how well you understand the topic. The Assessments section offers several mini projects; each includes 15 questions of varying levels of difficulty. The course is available without registration, however, you can create an account with your email. This is recommended if you want to publish comments or contribute to the site.

pretty good resource. the 101 fundamentals of sql are insanely simple and easy to grasp.