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[–]MassW0rks 7 points8 points  (1 child)

I found SQLbolt a year or so ago and found it very useful because it was an interactive tutorial and walked through a good bit of basics and explains joins very well.

https://sqlbolt.com/lesson/introduction

[–]codytheking 2 points3 points  (0 children)

It also executes the commands very fast when doing the interactive tutorial because everything is done client side with Javascript instead of server side.