Where can I download sample Mysql database?

This is not a direct download but it has useful code for creating an HR system with tables and data at: http://www.sqltutorial.org/sql-sample-database/

http://dev.mysql.com/doc/index-other.html lists some sample databases you can download.

https://launchpad.net/test-db/+download

includes an installation script and a test suite too. good source.