title: Public SQL database for educational purposes
body: <p>I am looking for a publicly available SQL database with free access, where one can run some <code>SELECT</code> queries for free on some meaningful data (not item1, item2, item3). Have you seen any? Even better if it came together with some tutorial.</p>
  
  <p>Vendor is not that relevant, as long as one can connect using a generic JDBC client.</p>