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

I suggest to ask your government for some statistical data (just browse their website; there should be plenty). Then import the data in a H2 database and import it. Save the resulting DB files somewhere and give them to your students for their work.