title: Online databases for trying out Oracle SQL queries?
body: <p>I am studying for an undergraduate databases course.</p>
  
  <p>I'd like to know if there are any online sites that allow me to do queries against an already built and populated database (with a known schema), so I didn't have to install SQL and populate it with data myself.</p>
  
  <p>I am currently doing some exercises by hand on a workbook I have here, but I'm a bit afraid that I might be doing them wrong and it's hard to check their correctness without testing them against the "real thing".</p>
  
  <p>Thanks</p>
  
  <p>(In our course we are using Oracle)</p>