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pretty basic. nothing past a simple inner join and group by. nothing to download as far as I could see (completed all chapters).

Anyone aware of similar online lessons to learn and practice SQL interactively ?

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SQLzoo.net has quite a bit of lessons. It has both interactive practice sections and multiple choice questions at the end of each lesson. I found that it wasn't well organized though, the path you follow wasn't obvious.

also, LOTS of broken English in the instructions. needs a lot of refinement

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