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I have some very basic knowledge in SQL which I mainly learn from some theoretical data science course. I would like to write a few lines of SQL just to experiment and train myself.

Can you please suggest a few free relational database for which I could write a few queries? Those databases can be about health, economy, climate change, social interaction, genetics, .... whatever seems to be of interest to most people.

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    Well, you could always look at the Stack Exchange Data Explorer; see the help link for more info. – RDFozz Aug 1 '17 at 20:27
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    Asking for software recommendations here is off-topic. Try the Software Recommendations Stack Exchange. It already has several Questions asking about databases. If none of those fit your needs, post a Question that is very specific about your criteria. And, yes, there are several good free-of-cost open-source databases to choose from such as H2, Postgres, etc. – Basil Bourque Aug 2 '17 at 0:01
  • @BasilBourque Correct me if I am wrong but I am asking for a database recommendation, not a software recommendation. Plus, there is a tag named database-recommendation. I would agree that I don't give much specification about what kind of database I am asking though which feels like a potential reason to vote to close. – Remi.b Aug 2 '17 at 0:03
  • I'm not sure about the standards here myself; we’ll see what the community says. Either way, I'm glad to see you participating here. Good luck, have fun. – Basil Bourque Aug 2 '17 at 0:07
  • From the definition of database-recommendation: "Determining what database product best fits the requirements and limitations in a specific situation. This is advice that generally requires much more insight into requirements than can easily be gleaned on a Q&A forum such as StackExchange.". You didn't post any specific requirements nor a specific situation, hence the "Vote to Close". – John aka hot2use Aug 2 '17 at 6:25
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https://www.lynda.com/ has free online classes. Some of which include practice databases and datasets to work with. Or you might try Gale. https://education.gale.com/l-slcl/

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