Hi
For any ERP system you can do the trail version which is freely available below mention links. i thing you may not get the sample database.
http://www.sap.com/software-free-trials/index.epx
http://www.sdn.sap.com/irj/sdn/index?rid=/library/uuid/80db43c2-9ee5-2d10-de8e-8547de363868
http://www.sdn.sap.com/irj/scn/nw-downloads
Thanks
Sriram