Online databases for trying out Oracle SQL queries? [closed]

Question

I am studying for an undergraduate databases course.

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.

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".

Thanks

(In our course we are using Oracle)

Answer 1

Have you tried SQLZoo ?

You can (for free) install SQL Server 2008 R2 Express Edition, and download and install already populated databases (such as AdventureWorks2008) from here. Both installs are straight forward.