I recently found an interesting tool to play with databases, SQLFiddle.
The tool is used to share some fragments of code, running on a live database, to allow users to not only see (read) the code, but also actually execute it, to play with the code.
See this link for all the details.
The nice part is that MySQL 5.5 is part of the supported databases, try it here.
It gets better: MySQL 5.6 is also there, so you get to …