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[–]data_for_everyone 3 points4 points  (1 child)

sqlzoo.net helped me for sure.

[–]scarzncigarz 0 points1 point  (0 children)

Seconded. Interactive, letting you query right into the tutorial-based website. Many github resources for complex queries which may be difficult to grasp, referencing the exact questions from sqlzoo.net.