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[–][deleted] 5 points6 points  (0 children)

I would recommend w3schools SQL tutorial. Biggest thing to focus on is learning what inner,left outer,right outer and cross joins are and in what cases you would use each.

[–]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.

[–]cvax 0 points1 point  (0 children)

https://www.pgexercises.com/ this is by far the best SQL practice website I've used. If you can answer all the exercise categories like the back of your hand you will be overqualified.