Public SQL database for educational purposes

Question

I am looking for a publicly available SQL database with free access, where one can run some SELECT queries for free on some meaningful data (not item1, item2, item3

Answer 1

If SQL Server is an option then Northwind/Adventureworks are the standard "training" DBs. Do a search.

For mySql this project looks promising:

http://sourceforge.net/projects/awmysql/

Also, this might be a dupe:

Is there a "Northwind" type database available for MySQL?

Where can I download Northwind database for Postgresql?