Online databases for trying out Oracle SQL queries? [closed]
Solution 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.
Solution 2:
If you don't want to go far, do try the StackExchange Data Explorer:
About
Stack Exchange Data Explorer allows you to run arbitrary queries on the Stack Exchange public data dumps.
It's fast and supports a SQLServer-like T-SQL syntax.