SQLZOO is a free set of interactive browser-based SQL exercises that let learners practice queries against sample databases, covering basic SELECT through joins and aggregates.

Commenters recommend it as a practice companion for syntax, pairing it with video lectures; one calls it highly recommended after starting with the Stanford course.

On Reddit (2)

1. Strongly recommendsgoogleoverlordsr/learnprogramming2016in “Good free resources for learning databases and SQL?”▲ 2

   I've started the Stanford course and done several of the SLQZOO exercises and I highly recommend both of them... I was a total noob before beginning and the Stanford course guides you quite well

2. RecommendsDonnyTheWalrusr/learnprogramming2016in “Help me find an SQL crash course”▲ 1

   For interview-type information, and as someone who didn't know much at all about relational databases and SQL, I can highly recommend courses from this Stanford online module, particularly the Intro, Relational Algebra, and SQL minicourses. You'll need to have a bit of a tolerance for high…

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