So, I've recently started learning SQL, but I've hit a bit of a roadblock: nothing seems to be offered online besides the most basic topics. I used the tutorial at khan academy and GalaXQL but there doesn't really seem to be a site with more advanced problems than those contained within the previous two sites. Does anyone know of a place I can get used to more advanced queries / challenge myself further? I'm working within a T SQL environment, so anything related to that would be great, but I'll be happy with anything I can get.
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