Oracle / mySQL Database Practice Exercises

Does anyone know of a website where I can download an Oracle or MySQL database and practice queries on it? I'm looking for something that gives you a tutorial and let's you practice on the actual database which includes also the ERD for a better reference. I know there are some websites that offer something online but I would like to go into more depth such as JOINS etc.

And which would be the best database IDK to download and practice with?
 
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